Refs #12083 & #12037

* Deprecate .pull-right class for .blockquote-reverse
* Move font-size change to the parent, blockquote, instead of setting on the p element to allow more flexible content

'as well' was used twice in sentence

Documentation (missing word)

New stuff:

* Adds `.has-feedback` and `.form-control-feedback` to show icon-based
form feedback to users. Fixes #11836.
* Removes the `width: 1em` on `.glyphicon` because it makes it
impractical to resize the width of all icons, even if they’re not
“empty” (e.g., a simple `.glyphicon { width: 30px; }` wouldn’t work,
nor would a class preceeded by a parent class.

Clean up:

* Sets `width: auto;` on all `.form-control`s within inline forms.
* Removes all the inline `select` menu `width` styles because all
inputs are now `auto`.
* Update form states docs to separate out sections better.

Fixes #11572: Add contextual background-color classes to match text classes; move both sets of classes to Helper Classes section of the CSS docs

/cc #10711 #9862

Fixes #11436: mention in docs that .container isn't nestable; update docs to mention width, not max-width

Links to same-page anchors were treated as external links.