Fix wrong file versions in update docs (5.2 to 5.3)

add db index for authentication_token column in users table

Conflicts:
	doc/install/installation.md

Remove unused but slow code

Fix paths to the Contents Markdown pages

Scrum view style milestone view.

Fix spelling error and make sure you never log in as git user so you never have to logout to run sudo.

Switch form from table to plain form without member list

Prevent overflow of comment code in event body. Add border-radius to highlight code inside note body