Doc: How to Add A Menu to the Sidebar

This item is tagged so as to appear under Customise TiddlyWiki.
put notifications above topbar
Docs tweaks
Add @tobibeer's TB5 resource
Merge pull request #1127 from tobibeer/fix-notification-z-index

put tc-notification above topbar
Merge pull request #1126 from xcazin/fred

Tweaks related to the fr-FR edition
Clean up github contribution banner

Sorry @xcazin I think you may need to do some clearing up after this
Merge pull request #1091 from Marxsal/patch-3

Doc: How to Add A Menu to the Sidebar
Docs tweaks
Tag fix