Overhaul navbar alignment (.pull-) utilities (fixes #9440)

Now navbars have their own float utility classes, mixin-ed versions of
`.pull-left` and `.pull-right`.

* Removed chained `.navbar-nav.pull-right`
* Added `.navbar-left` and `.navbar-right` as mixins of the default
float utilities, but only above the `@grid-float-breakpoint` to match
the new navbar behavior
* Updated components docs to match the new changeas
* Added callout about component alignment here to explain the new
classes
fixes #9439: use overflow: auto on navbar collapse
remove accordion from customizer; shorten min height for affix
Typo
Merge pull request #9443 from mattleff/patch-1

Tiny typo in class prefix
Fix .navbar-right > .dropdown-menu alignment
fixes issue after navbar is collapsed, dropdown-menus on uncollapsed menu are no longer visible
Apply mixin to correct class
Merge pull request #9451 from Luis-TP/3.0.0-wip

Fix .navbar-right > .dropdown-menu alignment
tweak punctuation in sentence of docs
rm `action` attr from highlighted example code too

fixup to e61c71e0775f676c3e404e7a8853949c78bc4511
CSS Grid old classes in use
Merge pull request #9463 from PMPP/css-ex-fix

CSS Grid old classes in use
fixes #9406: proper border for justified btn-groups inside tables
Ordered breadcrumbs
Reference only not minified files in Bower

Fixes #8985
Remove old accordion remnant
Made panel-variant apply styles only to first child
Added hidden-print class to docs sidebar
Remove .navbar-collapse padding when not in mobile context