want to update file availability table to be a little easier to read

[ChristinaLK]

something like:

Size of files	Location to use	Method of transfer to jobs	Guide	Privacy
Input up to 100MB, output up to 4GB	/home/user	list in submit file	file-availability	note
Input ONLY: up to 1GB, files shared across many jobs	/squid/user	link in submit file	file-avail-squid	note
Input > 100MB, output > 4GB	/staging/user	move in executable	file-availability	note

file to edit is:

https://github.com/CHTC/chtc-website-source/blob/master/_layouts/file_avail.html

[ChristinaLK]

cc @rachellombardi
😁