Improve front matter "added" params

Add missing ones and add the ability to show or hide the badge

Fixes a few more 404 errors in the version picker

site/content/docs/5.3/components/placeholders.md

@@ -4,7 +4,8 @@ title: Placeholders
 description: Use loading placeholders for your components or pages to indicate something may still be loading.
 group: components
 toc: true
-added: "5.1"
+added:
+  version: "5.1"
 ---
 
 ## About

site/content/docs/5.3/customize/color-modes.md

@@ -4,7 +4,8 @@ title: Color modes
 description: Bootstrap now supports color modes, or themes, as of v5.3.0. Explore our default light color mode and the new dark mode, or create your own using our styles as your template.
 group: customize
 toc: true
-added: "5.3"
+added:
+  version: "5.3"
 ---
 
 {{< callout >}}

site/content/docs/5.3/getting-started/contribute.md

@@ -5,6 +5,9 @@ description: Help develop Bootstrap with our documentation build scripts and tes
 group: getting-started
 toc: true
 aliases: "/docs/5.3/getting-started/build-tools/"
+added:
+  show_badge: false
+  version: "5.1"
 ---
 
 ## Tooling setup

site/content/docs/5.3/getting-started/vite.md

@@ -5,6 +5,9 @@ description: The official guide for how to include and bundle Bootstrap's CSS an
 group: getting-started
 toc: true
 thumbnail: guides/bootstrap-vite@2x.png
+added:
+  show_badge: false
+  version: "5.2"
 ---
 
 <img class="mb-4 img-fluid rounded-3" srcset="/docs/{{< param docs_version >}}/assets/img/guides/bootstrap-vite.png, /docs/{{< param docs_version >}}/assets/img/guides/bootstrap-vite@2x.png 2x" src="/docs/{{< param docs_version >}}/assets/img/guides/bootstrap-vite.png" width="2000" height="1000" alt="">

site/content/docs/5.3/helpers/color-background.md

@@ -4,7 +4,8 @@ title: Color and background
 description: Set a background color with contrasting foreground color.
 group: helpers
 toc: true
-added: "5.2"
+added:
+  version: "5.2"
 ---
 
 ## Overview

site/content/docs/5.3/helpers/focus-ring.md

@@ -4,7 +4,8 @@ title: Focus ring
 description: Utility classes that allows you to add and modify custom focus ring styles to elements and components.
 group: helpers
 toc: true
-added: "5.3"
+added:
+  version: "5.3"
 ---
 
 The `.focus-ring` helper removes the default `outline` on `:focus`, replacing it with a `box-shadow` that can be more broadly customized. The new shadow is made up of a series of CSS variables, inherited from the `:root` level, that can be modified for any element or component.

site/content/docs/5.3/helpers/icon-link.md

@@ -4,7 +4,8 @@ title: Icon link
 description: Quickly create stylized hyperlinks with Bootstrap Icons or other icons.
 group: helpers
 toc: true
-added: 5.3
+added:
+  version: "5.3"
 ---
 
 The icon link helper component modifies our default link styles to enhance their appearance and quickly align any pairing of icon and text. Alignment is set via inline flexbox styling and a default `gap` value. We stylize the underline with a custom offset and color. Icons are automatically sized to `1em` to best match their associated text's `font-size`.

site/content/docs/5.3/helpers/stacks.md

@@ -4,7 +4,8 @@ title: Stacks
 description: Shorthand helpers that build on top of our flexbox utilities to make component layout faster and easier than ever.
 group: helpers
 toc: true
-added: "5.1"
+added:
+  version: "5.1"
 ---
 
 Stacks offer a shortcut for applying a number of flexbox properties to quickly and easily create layouts in Bootstrap. All credit for the concept and implementation goes to the open source [Pylon project](https://almonk.github.io/pylon/).

site/content/docs/5.3/helpers/vertical-rule.md

@@ -4,7 +4,8 @@ title: Vertical rule
 description: Use the custom vertical rule helper to create vertical dividers like the `<hr>` element.
 group: helpers
 toc: true
-added: "5.1"
+added:
+  version: "5.1"
 ---
 
 ## How it works

site/content/docs/5.3/layout/css-grid.md

@@ -4,7 +4,8 @@ title: CSS Grid
 description: Learn how to enable, use, and customize our alternate layout system built on CSS Grid with examples and code snippets.
 group: layout
 toc: true
-added: "5.1"
+added:
+  version: "5.1"
 ---
 
 Bootstrap's default grid system represents the culmination of over a decade of CSS layout techniques, tried and tested by millions of people. But, it was also created without many of the modern CSS features and techniques we're seeing in browsers like the new CSS Grid.

site/content/docs/5.3/utilities/link.md

@@ -4,7 +4,8 @@ title: Link
 description: Link utilities are used to stylize your anchors to adjust their color, opacity, underline offset, underline color, and more.
 group: utilities
 toc: true
-added: 5.3
+added:
+  version: "5.3"
 ---
 
 ## Link opacity

site/content/docs/5.3/utilities/object-fit.md

@@ -4,6 +4,8 @@ title: Object fit
 description: Use the object fit utilities to modify how the content of a [replaced element](https://developer.mozilla.org/en-US/docs/Web/CSS/Replaced_element), such as an `<img>` or `<video>`, should be resized to fit its container.
 group: utilities
 toc: true
+added:
+  version: "5.3"
 ---
 
 ## How it works

site/content/docs/5.3/utilities/opacity.md

@@ -3,7 +3,8 @@ layout: docs
 title: Opacity
 description: Control the opacity of elements.
 group: utilities
-added: "5.1"
+added:
+  version: "5.1"
 ---
 
 The `opacity` property sets the opacity level for an element. The opacity level describes the transparency level, where `1` is not transparent at all, `.5` is 50% visible, and `0` is completely transparent.

site/content/docs/5.3/utilities/z-index.md

@@ -4,7 +4,8 @@ title: Z-index
 description: Use our low-level `z-index` utilities to quickly change the stack level of an element or component.
 group: utilities
 toc: true
-added: "5.3"
+added:
+  version: "5.3"
 ---
 
 ## Example

site/layouts/_default/docs.html

@@ -18,8 +18,9 @@
       <div class="bd-intro pt-2 ps-lg-2">
         <div class="d-md-flex flex-md-row-reverse align-items-center justify-content-between">
           <div class="mb-3 mb-md-0 d-flex text-nowrap">
-            {{- if .Page.Params.added -}}
+            {{- /* This is needed because we want to show the badge if show_badge isn't present or is set to false */ -}}
-              <small class="d-inline-flex px-2 py-1 fw-semibold text-success-emphasis bg-success-subtle border border-success-subtle rounded-2 me-2">Added in v{{ .Page.Params.added }}</small>
+            {{- if (or (and (.Page.Params.added) (not (isset .Page.Params.added "show_badge"))) (and (.Page.Params.added) (isset .Page.Params.added "show_badge") (not (eq .Page.Params.added.show_badge false)))) -}}
+              <small class="d-inline-flex px-2 py-1 fw-semibold text-success-emphasis bg-success-subtle border border-success-subtle rounded-2 me-2">Added in v{{ .Page.Params.added.version }}</small>
             {{- end -}}
             <a class="btn btn-sm btn-bd-light rounded-2" href="{{ .Site.Params.repo }}/blob/v{{ .Site.Params.current_version }}/site/content/{{ .Page.File.Path | replaceRE `\\` "/" }}" title="View and edit this file on GitHub" target="_blank" rel="noopener">
               View on GitHub

site/layouts/partials/docs-versions.html

@@ -10,9 +10,9 @@
   {{- $versions_link = printf "%s/" $page_slug -}}
 {{- end -}}
 
-{{- $added_in_51 := eq (string .Page.Params.added) "5.1" -}}
+{{- $added_in_51 := eq (string .Page.Params.added.version) "5.1" -}}
-{{- $added_in_52 := eq (string .Page.Params.added) "5.2" -}}
+{{- $added_in_52 := eq (string .Page.Params.added.version) "5.2" -}}
-{{- $added_in_53 := eq (string .Page.Params.added) "5.3" -}}
+{{- $added_in_53 := eq (string .Page.Params.added.version) "5.3" -}}
 
 <li class="nav-item dropdown">
   <button type="button" class="btn btn-link nav-link py-2 px-0 px-lg-2 dropdown-toggle" data-bs-toggle="dropdown" aria-expanded="false" data-bs-display="static">