docs: add global search

docs/docs/configuration/search.md

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+---
+sidebar_position: 3
+---
+
+# Search & Sorting
+
+![image](search1.png)
+
+Click on the column header to sort by that column. Click again to reverse the sort order.
+
+Click on the search icon to open the search input field. Both `glob` and `regex` engines are available to search the current folder and all descendants of the current folder.
+
+### Glob-based search
+
+This is the recommended search engine for most users. It is simple to use and faster than the regex engine.
+
+| Pattern        | Description                                                                                                                                |
+|----------------|--------------------------------------------------------------------------------------------------------------------------------------------|
+| `*`           | Matches zero or more characters.                                                                                                           |
+| `?`           | Matches exactly one character (any character).                                                                                             |
+| `[...]`       | Matches one character from a group of characters. If the first character is `!`, it matches any character *not* in the group.              |
+| `\`           | Escapes the following character.                                                             |
+
+[Learn more](https://en.wikipedia.org/wiki/Glob_(programming))
+
+### Regex-based search
+
+[Learn more](https://en.wikipedia.org/wiki/Regular_expression)
+
+import EnvConfig from '@site/src/components/EnvConfig';
+
+<EnvConfig name="SEARCH|SEARCH_ENGINE|SEARCH_MAX_DEPTH|SEARCH_MAX_RESULTS|REVERSE_SORT" init="true|glob|25|100|false" values="true,false|glob,regex|integer|integer|true,false" versions="3.7|3.7|3.7|3.7|1.0" desc="Enables or disables the search functionality|Search engine to evaluate query|Maximum recursive search depth (regex engine only)|Maximum number of results in a single request|By default files and folders are sorted by name using natural sort."/>