Add missing update docs from 5.2 to 5.3 to 5.3 stable branch

raise App Version to stable Branch 5.3

Remove unused but slow code

Fix paths to the Contents Markdown pages

Scrum view style milestone view.

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

Add asciidoctor gem.