More work on the sidenotes

* Convert more inline advices (compatibility, dependencies, ...) to
sidenotes
* Add sidenotes for:
** Note on plugin dependencies in general
** Required padding for navbar-fixed- (incl. code snippet)
* Fixed text for the small tag
redo all the things
More contrast with code snippets in sidenotes
use spaces for indenting, not tabs /cc @juthilo
shorter copy
lighter .highlight in sidenotes as well
more copy edits to sidenotes
Merge branch '3.0.0-wip' into bs3_homepage
nuke hidden homepage content
nuke all the assets
center
change var from @table-border to @table-border-color
Fixes #5256: Use > selector for better nesting of tables
Merge branch 'bs3_homepage' into 3.0.0-wip
Changes to bootstrap
more nested navs
Merge pull request #7590 from Fowowski/3.0.0-wip

more nested less rules - navs component
watchr should be lower-case
change nav's #tables-hover to #tables-hover-rows
more nested pager.less