Fix project section header button's layout (#4324)

1. [Fix project section header button's
layout](https://github.com/HyphaApp/hypha/commit/5b77ac08914f9d661759fac79c1d5cb3ffb00440)
2. [Update and fix the layout of supporting document
display](https://github.com/HyphaApp/hypha/commit/d5d5cf9360504d8491d3c2dec59ee407374a9377)
	- add a bg to easily separate two document category
	- handle long filenames
	- add hover state to links / buttons

Fixes https://github.com/HyphaApp/hypha/issues/4321




Co-authored-by: Fredrik Jonsson <frjo@xdeb.org>