Move to middleman 4

Gemfile

@@ -3,7 +3,7 @@
 source 'http://rubygems.org'
 source 'https://rails-assets.org'
 
-gem "middleman", "~> 3.3.3"
+gem "middleman", "~> 4"
 
 gem "middleman-livereload"
 gem 'middleman-sprockets'

Gemfile.lock

@@ -2,185 +2,173 @@ GEM
   remote: http://rubygems.org/
   remote: https://rails-assets.org/
   specs:
-    activesupport (4.1.16)
-      i18n (~> 0.6, >= 0.6.9)
-      json (~> 1.7, >= 1.7.7)
-      minitest (~> 5.1)
-      thread_safe (~> 0.1)
-      tzinfo (~> 1.1)
-    autoprefixer-rails (9.7.4)
-      execjs
+    activesupport (6.1.4.4)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 1.6, < 2)
+      minitest (>= 5.1)
+      tzinfo (~> 2.0)
+      zeitwerk (~> 2.3)
+    addressable (2.8.0)
+      public_suffix (>= 2.0.2, < 5.0)
+    autoprefixer-rails (10.4.0.0)
+      execjs (~> 2)
+    backports (3.23.0)
     bootstrap-sass (3.4.1)
       autoprefixer-rails (>= 5.2.1)
       sassc (>= 2.0.0)
     builder (3.2.4)
-    celluloid (0.16.0)
-      timers (~> 4.0.0)
-    chunky_png (1.3.11)
-    coderay (1.1.2)
+    coderay (1.1.3)
     coffee-script (2.4.1)
       coffee-script-source
       execjs
     coffee-script-source (1.12.2)
-    compass (1.0.3)
-      chunky_png (~> 1.2)
-      compass-core (~> 1.0.2)
-      compass-import-once (~> 1.0.5)
-      rb-fsevent (>= 0.9.3)
-      rb-inotify (>= 0.9)
-      sass (>= 3.3.13, < 3.5)
-    compass-core (1.0.3)
-      multi_json (~> 1.0)
-      sass (>= 3.3.0, < 3.5)
-    compass-import-once (1.0.5)
-      sass (>= 3.2, < 3.5)
+    concurrent-ruby (1.1.9)
+    contracts (0.13.0)
     crass (1.0.6)
-    docile (1.3.2)
-    em-websocket (0.5.1)
+    docile (1.4.0)
+    dotenv (2.7.6)
+    em-websocket (0.5.3)
       eventmachine (>= 0.12.9)
-      http_parser.rb (~> 0.6.0)
+      http_parser.rb (~> 0)
     erubis (2.7.0)
     eventmachine (1.2.7)
-    execjs (2.7.0)
+    execjs (2.8.1)
+    fast_blank (1.0.1)
+    fastimage (2.2.6)
     favicon_maker (1.3.1)
       docile (~> 1.1)
-    feedjira (3.1.1)
+    feedjira (3.2.1)
       loofah (>= 2.3.1)
       sax-machine (>= 1.0)
-    ffi (1.12.2)
-    font-awesome-middleman (4.5.0)
-      middleman-core (~> 3.0)
-    haml (5.1.2)
+    ffi (1.15.4)
+    font-awesome-middleman (4.2.1)
+      middleman-core (>= 3.0.0)
+    haml (5.2.2)
       temple (>= 0.8.0)
       tilt
-    hike (1.2.3)
-    hitimes (2.0.0)
-    hooks (0.4.1)
-      uber (~> 0.0.14)
-    http_parser.rb (0.6.0)
-    i18n (0.7.0)
-    json (1.8.6)
-    kramdown (1.17.0)
-    libv8 (3.16.14.19)
-    listen (2.10.1)
-      celluloid (~> 0.16.0)
-      rb-fsevent (>= 0.9.3)
-      rb-inotify (>= 0.9)
-    loofah (2.4.0)
+    hamster (3.0.0)
+      concurrent-ruby (~> 1.0)
+    hashie (3.6.0)
+    http_parser.rb (0.8.0)
+    i18n (1.6.0)
+      concurrent-ruby (~> 1.0)
+    kramdown (2.3.1)
+      rexml
+    libv8 (3.16.14.19-x86_64-linux)
+    listen (3.0.8)
+      rb-fsevent (~> 0.9, >= 0.9.4)
+      rb-inotify (~> 0.9, >= 0.9.7)
+    loofah (2.13.0)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
-    middleman (3.3.12)
+    memoist (0.16.2)
+    middleman (4.4.2)
       coffee-script (~> 2.2)
-      compass (>= 1.0.0, < 2.0.0)
-      compass-import-once (= 1.0.5)
-      execjs (~> 2.0)
       haml (>= 4.0.5)
-      kramdown (~> 1.2)
-      middleman-core (= 3.3.12)
-      middleman-sprockets (>= 3.1.2)
-      sass (>= 3.4.0, < 4.0)
-      uglifier (~> 2.5)
-    middleman-core (3.3.12)
-      activesupport (~> 4.1.0)
-      bundler (~> 1.1)
+      kramdown (>= 2.3.0)
+      middleman-cli (= 4.4.2)
+      middleman-core (= 4.4.2)
+    middleman-cli (4.4.2)
+      thor (>= 0.17.0, < 2.0)
+    middleman-core (4.4.2)
+      activesupport (>= 6.1, < 7.0)
+      addressable (~> 2.4)
+      backports (~> 3.6)
+      bundler (~> 2.0)
+      contracts (~> 0.13.0)
+      dotenv
       erubis
-      hooks (~> 0.3)
-      i18n (~> 0.7.0)
-      listen (>= 2.7.9, < 3.0)
-      padrino-helpers (~> 0.12.3)
-      rack (>= 1.4.5, < 2.0)
-      rack-test (~> 0.6.2)
-      thor (>= 0.15.2, < 2.0)
-      tilt (~> 1.4.1, < 2.0)
+      execjs (~> 2.0)
+      fast_blank
+      fastimage (~> 2.0)
+      hamster (~> 3.0)
+      hashie (~> 3.4)
+      i18n (~> 1.6.0)
+      listen (~> 3.0.0)
+      memoist (~> 0.14)
+      padrino-helpers (~> 0.15.0)
+      parallel
+      rack (>= 1.4.5, < 3)
+      sassc (~> 2.0)
+      servolux
+      tilt (~> 2.0.9)
+      toml
+      uglifier (~> 3.0)
+      webrick
     middleman-deploy (1.0.0)
       middleman-core (>= 3.2)
       net-sftp
       ptools
-    middleman-favicon-maker (3.7)
-      favicon_maker (~> 1.3)
-      middleman-core (>= 3.0.0)
-    middleman-livereload (3.4.6)
+    middleman-favicon-maker (4.1.0)
+      favicon_maker (~> 1.3, >= 1.3.1)
+      middleman-core (~> 4.0)
+    middleman-livereload (3.4.7)
       em-websocket (~> 0.5.1)
       middleman-core (>= 3.3)
       rack-livereload (~> 0.3.15)
-    middleman-sprockets (3.5.0)
-      middleman-core (>= 3.3)
-      sprockets (~> 2.12.1)
-      sprockets-helpers (~> 1.1.0)
-      sprockets-sass (~> 1.3.0)
+    middleman-sprockets (4.1.1)
+      middleman-core (~> 4.0)
+      sprockets (>= 3.0)
     middleman-syntax (3.2.0)
       middleman-core (>= 3.2)
       rouge (~> 3.2)
-    mini_portile2 (2.6.1)
-    minitest (5.14.0)
-    multi_json (1.14.1)
-    net-sftp (2.1.2)
-      net-ssh (>= 2.6.5)
-    net-ssh (5.2.0)
-    nokogiri (1.12.5)
-      mini_portile2 (~> 2.6.1)
+    minitest (5.15.0)
+    net-sftp (3.0.0)
+      net-ssh (>= 5.0.0, < 7.0.0)
+    net-ssh (6.1.0)
+    nokogiri (1.12.5-x86_64-linux)
       racc (~> 1.4)
-    nokogumbo (2.0.2)
-      nokogiri (~> 1.8, >= 1.8.4)
-    oj (3.10.5)
-    open-uri-cached (0.0.5)
-    padrino-helpers (0.12.9)
-      i18n (~> 0.6, >= 0.6.7)
-      padrino-support (= 0.12.9)
+    oj (3.13.10)
+    open-uri-cached (1.0.0)
+    padrino-helpers (0.15.1)
+      i18n (>= 0.6.7, < 2)
+      padrino-support (= 0.15.1)
       tilt (>= 1.4.1, < 3)
-    padrino-support (0.12.9)
-      activesupport (>= 3.1)
-    ptools (1.3.5)
+    padrino-support (0.15.1)
+    parallel (1.21.0)
+    parslet (2.0.0)
+    ptools (1.4.2)
+    public_suffix (4.0.6)
     racc (1.6.0)
-    rack (1.6.13)
+    rack (2.2.3)
     rack-livereload (0.3.17)
       rack
-    rack-test (0.6.3)
-      rack (>= 1.0)
     rails-assets-jquery (1.12.4)
-    rb-fsevent (0.10.3)
+    rb-fsevent (0.11.0)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
     ref (2.0.0)
-    rouge (3.16.0)
+    rexml (3.2.5)
+    rouge (3.27.0)
     ruby18_source_location (0.2)
-    sanitize (5.2.1)
+    sanitize (6.0.0)
       crass (~> 1.0.2)
-      nokogiri (>= 1.8.0)
-      nokogumbo (~> 2.0)
-    sass (3.4.25)
-    sassc (2.2.1)
+      nokogiri (>= 1.12.0)
+    sassc (2.4.0)
       ffi (~> 1.9)
     sax-machine (1.3.2)
-    sprockets (2.12.5)
-      hike (~> 1.2)
-      multi_json (~> 1.0)
-      rack (~> 1.0)
-      tilt (~> 1.1, != 1.3.0)
-    sprockets-helpers (1.1.0)
-      sprockets (~> 2.0)
-    sprockets-sass (1.3.1)
-      sprockets (~> 2.0)
-      tilt (~> 1.1)
+    servolux (0.13.0)
+    sprockets (4.0.2)
+      concurrent-ruby (~> 1.0)
+      rack (> 1, < 3)
     stringex (2.8.5)
     temple (0.8.2)
     therubyracer (0.12.3)
       libv8 (~> 3.16.14.15)
       ref
-    thor (1.0.1)
-    thread_safe (0.3.6)
-    tilt (1.4.1)
-    timers (4.0.4)
-      hitimes
-    tzinfo (1.2.6)
-      thread_safe (~> 0.1)
-    uber (0.0.15)
-    uglifier (2.7.2)
-      execjs (>= 0.3.0)
-      json (>= 1.8.0)
+    thor (1.1.0)
+    tilt (2.0.10)
+    toml (0.3.0)
+      parslet (>= 1.8.0, < 3.0.0)
+    tzinfo (2.0.4)
+      concurrent-ruby (~> 1.0)
+    uglifier (3.2.0)
+      execjs (>= 0.3.0, < 3)
+    webrick (1.7.0)
+    zeitwerk (2.5.3)
 
 PLATFORMS
-  ruby
+  x86_64-linux
 
 DEPENDENCIES
   bootstrap-sass
@@ -189,7 +177,7 @@ DEPENDENCIES
   feedjira
   font-awesome-middleman
   kramdown
-  middleman (~> 3.3.3)
+  middleman (~> 4)
   middleman-deploy
   middleman-favicon-maker
   middleman-livereload
@@ -206,4 +194,4 @@ DEPENDENCIES
   wdm (~> 0.1.0)
 
 BUNDLED WITH
-   1.17.2
+   2.2.22