Add missing trailing slash after #29144

* Follow-up to #29095

This PR fixes the responsive containers that were added in #29095, originally stubbed out in #25631. Apologies to @browner12 for getting that wrong.

Fixes #25631.

* update navbar as well because we cannot reset all containers uniformly

* Update navbars example to include container-xl example to ensure containers match

* rewrite responsive containers docs, add table of max-widths

* Update container docs
- Move table up to the intro
- Remove the container example because it's actually hella confusing
- Update and link to grid example as a demo instead

Fix Readonly plain text form alignment

Improvement to better understand how utilities class name are generated by the (_api.scss) base in the line of code below:
`$property-class: if($property-class, $property-class, nth($properties, 1));`

https://github.com/twbs/bootstrap/blob/fc02932946424e986a72bb7b47044eab815851cb/scss/mixins/_utilities.scss#L21

From #28948.

* Allow .page-links to get left margin.

* Add border-radius to page-links in case they have left margin

* Apply MartijnCuppens suggestion to _pagination.scss

Co-Authored-By: Martijn Cuppens <martijn.cuppens@gmail.com>

* Plus if/else Rules

* Formatting fixes

* Fix border-radius for pagination-size

* Use mixin for default pagination sizing

Since we build with `HUGO_ENV` set to `production` on Netlify, use another variable to prevent crawling.