v4: Social meta tags (#20825)

* descriptions for getting started pages

* descriptions for layout

* add content page descriptions

* more descriptions, updates to some existing ones

* correct site url

* add social stuff to config for twitter cards

* add twitter meta tags; use large image for homepage and regular card for all others

* add the assets

* more site config

* more social shiz to partial, remove existing meta for the partial, remove page title from homepage for simpler if statements

docs/components/alerts.md

@@ -1,6 +1,7 @@
 ---
 layout: docs
 title: Alerts
+description: Provide contextual feedback messages for typical user actions with the handful of available and flexible alert messages.
 group: components
 ---
 

docs/components/breadcrumb.md

@@ -1,6 +1,7 @@
 ---
 layout: docs
 title: Breadcrumb
+description: Indicate the current page's location within a navigational hierarchy.
 group: components
 ---
 

docs/components/button-group.md

@@ -1,6 +1,7 @@
 ---
 layout: docs
 title: Button group
+description: Group a series of buttons together on a single line with the button group, and super-power them with JavaScript.
 group: components
 ---
 

docs/components/buttons.md

@@ -1,6 +1,7 @@
 ---
 layout: docs
 title: Buttons
+description: Use Bootstrap's custom button styles for actions in forms, dialogs, and more with support for multiple sizes, states, and more.
 group: components
 redirect_from: "/components/"
 ---

docs/components/card.md

@@ -1,6 +1,7 @@
 ---
 layout: docs
 title: Cards
+description: Bootstrap Cards provide a flexible and extensible content container with multiple variants and options.
 group: components
 ---
 

docs/components/carousel.md

@@ -1,6 +1,7 @@
 ---
 layout: docs
 title: Carousel
+description: A slideshow component for cycling through elements—images or slides of text—like a carousel.
 group: components
 ---
 

docs/components/collapse.md

@@ -1,6 +1,7 @@
 ---
 layout: docs
 title: Collapse
+description: Toggle the visibility of content across your project with a few classes and our JavaScript plugins.
 group: components
 ---
 

docs/components/dropdowns.md

@@ -1,6 +1,7 @@
 ---
 layout: docs
 title: Dropdowns
+description: Toggle contextual overlays for displaying lists of links and more with the Bootstrap dropdown plugin.
 group: components
 ---
 

docs/components/forms.md

@@ -1,6 +1,7 @@
 ---
 layout: docs
 title: Forms
+description: Examples and usage guidelines for from controls, form layouts, and custom forms.
 group: components
 ---
 

docs/components/input-group.md

@@ -1,6 +1,7 @@
 ---
 layout: docs
 title: Input group
+description: Extend form controls with the input group.
 group: components
 ---
 

docs/components/jumbotron.md

@@ -1,6 +1,7 @@
 ---
 layout: docs
 title: Jumbotron
+description: Lightweight, flexible component for showcasing hero unit style content.
 group: components
 ---
 

docs/components/list-group.md

@@ -1,6 +1,7 @@
 ---
 layout: docs
 title: List group
+description: Learn about Bootstrap's list group component for rendering series of related content.
 group: components
 ---
 

docs/components/modal.md

@@ -1,6 +1,7 @@
 ---
 layout: docs
 title: Modal
+description: Learn how to use Bootstrap's modals to add dialog prompts to your site.
 group: components
 ---
 

docs/components/navbar.md

@@ -1,6 +1,7 @@
 ---
 layout: docs
 title: Navbar
+description: Documentation and examples for Bootstrap's powerful, responsive navigation header.
 group: components
 ---
 

docs/components/navs.md

@@ -1,6 +1,7 @@
 ---
 layout: docs
 title: Navs
+description: Documentation and examples for how to use Bootstrap's included navigation components.
 group: components
 ---
 

docs/components/pagination.md

@@ -1,6 +1,7 @@
 ---
 layout: docs
 title: Pagination
+description: Documentation and examples for showing pagination links.
 group: components
 ---
 

docs/components/popovers.md

@@ -1,6 +1,7 @@
 ---
 layout: docs
 title: Popovers
+description: Documentation and examples for adding Bootstrap popovers to your site.
 group: components
 ---
 

docs/components/progress.md

@@ -1,6 +1,7 @@
 ---
 layout: docs
 title: Progress
+description: Documentation and examples for using Bootstrap progress bars.
 group: components
 ---
 

docs/components/scrollspy.md

@@ -1,6 +1,7 @@
 ---
 layout: docs
 title: Scrollspy
+description: Documentation and examples for the scrollspy plugin with Bootstrap's navigation components.
 group: components
 ---
 

docs/components/tag.md

@@ -1,6 +1,7 @@
 ---
 layout: docs
 title: Tags
+description: Documentation and examples for tags, our small label-badge component.
 group: components
 ---
 

docs/components/tooltips.md

@@ -1,6 +1,7 @@
 ---
 layout: docs
 title: Tooltips
+description: Documentation and examples for adding custom Bootstrap tooltips with CSS and JavaScript.
 group: components
 ---