Update docs for Bootstrap 5

* `docs/release-notes.md` — add a 6.0.0 entry under "Breaking changes"
  covering the requirement bumps to MediaWiki 1.43, PHP 8.1, and the
  Bootstrap extension 6.x (which bundles Bootstrap library 5.3).
  The MediaWiki and PHP bumps were committed to master after the
  5.2.3 tag (master commit "Raise MediaWiki floor to 1.43, PHP floor
  to 8.1") so they ride along with the 6.0 release. Per-class /
  per-attribute detail is deferred to the follow-up migration-guide
  doc, matching the precedent set by the 4.0.0 entry for the previous
  foundation lift. The bug-fix entries that already shipped in
  5.2.3 / 5.2.4 are not re-listed under 6.0 since 6.0 inherits them
  from the 5.x line.
* `docs/components.md` — note the jumbotron now emits utility classes
  instead of the removed `.jumbotron` class.
* `docs/components/*.md` — update Bootstrap-version text references
  (`4.1` -> `5.3` doc URLs).
* `docs/components/jumbotron.md` — drop the long-standing inaccurate
  "It also enlarges the font sizes of the text inside it" claim
  (Bootstrap 4's `.jumbotron` had no rule for contained-heading
  sizes either; verified empirically, headlines inside vs outside
  are identical font-size on both framework versions). Add a "Note"
  callout placing the Bootstrap 5 context.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: malberts

docs/components.md

@@ -22,6 +22,8 @@ the following components are available to be used inside the wiki text:
   want to hide and show large amount of content.
 * **[Jumbotron](components/jumbotron.md)**: A jumbotron indicates a big
   box for calling extra attention to some special content or information.
+  _Bootstrap 5 removed `.jumbotron`; the parser function is retained,
+  now emitting Bootstrap 5 utility classes for an equivalent look._
 * **[Modal](components/modal.md)**: The Modal component is a dialog
   box/popup window that is displayed on top of the current page.
 * **[Popover](components/popover.md)**: The Popover component produces a

docs/components/accordion.md

@@ -40,6 +40,5 @@ add multiple css styles, separate them by a semicolon.</dd>
 </dl>
 
 ### Links
-* https://getbootstrap.com/docs/4.1/components/collapse/#accordion-example
-* https://www.w3schools.com/bootstrap4/bootstrap_collapse.asp
+* https://getbootstrap.com/docs/5.3/components/accordion/
 

docs/components/alert.md

@@ -54,6 +54,5 @@ add multiple css styles, separate them by a semicolon.</dd>
 </dl>
 
 ### Links
-* https://getbootstrap.com/docs/4.1/components/alerts/
-* https://www.w3schools.com/bootstrap4/bootstrap_alerts.asp
-* https://getbootstrap.com/docs/4.1/utilities/colors/
+* https://getbootstrap.com/docs/5.3/components/alerts/
+* https://getbootstrap.com/docs/5.3/utilities/colors/

docs/components/badge.md

@@ -52,7 +52,6 @@ add multiple css styles, separate them by a semicolon.</dd>
 </dl>
 
 ### Links
-* https://getbootstrap.com/docs/4.1/components/badge/
-* https://www.w3schools.com/bootstrap4/bootstrap_badges.asp
-* https://getbootstrap.com/docs/4.1/utilities/colors/
+* https://getbootstrap.com/docs/5.3/components/badge/
+* https://getbootstrap.com/docs/5.3/utilities/colors/
 *

docs/components/button.md

@@ -78,7 +78,6 @@ background with button color.</dd>
 
 
 ### Links
-* https://getbootstrap.com/docs/4.1/components/buttons/
-* https://www.w3schools.com/bootstrap4/bootstrap_buttons.asp
-* https://getbootstrap.com/docs/4.1/utilities/colors/
+* https://getbootstrap.com/docs/5.3/components/buttons/
+* https://getbootstrap.com/docs/5.3/utilities/colors/
 *

docs/components/card.md

@@ -109,6 +109,5 @@ add multiple css styles, separate them by a semicolon.</dd>
 </dl>
 
 ### Links
-* https://getbootstrap.com/docs/4.1/components/card/
-* https://www.w3schools.com/bootstrap4/bootstrap_cards.asp
-* https://getbootstrap.com/docs/4.1/utilities/colors/
+* https://getbootstrap.com/docs/5.3/components/card/
+* https://getbootstrap.com/docs/5.3/utilities/colors/

docs/components/carousel.md

@@ -38,5 +38,4 @@ attributes, otherwise the parser will drop all but one:
 ```
 
 ### Links
-* https://getbootstrap.com/docs/4.1/components/carousel/
-* https://www.w3schools.com/bootstrap4/bootstrap_carousel.asp
+* https://getbootstrap.com/docs/5.3/components/carousel/

docs/components/collapse.md

@@ -29,5 +29,4 @@ be used as the trigger element. In this case, all but the attributes
 </dl>
 
 ### Links
-* https://getbootstrap.com/docs/4.1/components/collapse/
-* https://www.w3schools.com/bootstrap4/bootstrap_collapse.asp
+* https://getbootstrap.com/docs/5.3/components/collapse/

docs/components/jumbotron.md

@@ -1,9 +1,14 @@
 ## Jumbotron
+
+> **Note.** Bootstrap 5 removed the `.jumbotron` component. The
+> `bootstrap_jumbotron` parser function is retained for backward
+> compatibility and now emits the equivalent Bootstrap 5 utility-class
+> combination per the official migration guide linked below.
+
 A jumbotron indicates a big box for calling extra attention to some special
 content or information.
 
-A jumbotron is displayed as a grey box with rounded corners. It also enlarges
-the font sizes of the text inside it.
+A jumbotron is displayed as a grey box with rounded corners.
 
 See also:
 * [Alert](alert.md)
@@ -33,5 +38,5 @@ add multiple css styles, separate them by a semicolon.</dd>
 </dl>
 
 ### Links
-* https://getbootstrap.com/docs/4.1/components/jumbotron/
-* https://www.w3schools.com/bootstrap4/bootstrap_jumbotron.asp
+* https://getbootstrap.com/docs/5.3/migration/#jumbotron
+* https://getbootstrap.com/docs/5.3/examples/jumbotron/

docs/components/modal.md

@@ -76,8 +76,7 @@ be used as the trigger element.</dd>
 </dl>
 
 ### Links
-* https://getbootstrap.com/docs/4.1/components/modal/
-* https://www.w3schools.com/bootstrap4/bootstrap_modal.asp
-* https://getbootstrap.com/docs/4.1/utilities/colors/
+* https://getbootstrap.com/docs/5.3/components/modal/
+* https://getbootstrap.com/docs/5.3/utilities/colors/
 
 Please, see also the [known issues](../known-issues.md) with this component.