docs: bundle assets with Hugo

Also:

* load any docs' third-party dependencies from node_modules (except for examples)
* exclude docsearch from layouts that don't use it
* preconnect to algolia only when not examples layout
* switch to `RelPermalink`
* refactor JS assets into partials

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

@@ -38,7 +38,7 @@ Click the button below to show an alert (hidden with inline styles to start), th
 
 We use the following JavaScript to trigger our live alert demo:
 
-{{< js-docs name="live-alert" file="site/assets/js/snippets.js" >}}
+{{< js-docs name="live-alert" file="site/assets/js/partials/snippets.js" >}}
 
 ### Link color
 

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

@@ -481,7 +481,7 @@ Below is a live demo followed by example HTML and JavaScript. For more informati
 </div>
 {{< /example >}}
 
-{{< js-docs name="varying-modal-content" file="site/assets/js/snippets.js" >}}
+{{< js-docs name="varying-modal-content" file="site/assets/js/partials/snippets.js" >}}
 
 ### Toggle between modals
 

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

@@ -87,7 +87,7 @@ Click the button below to show a toast (positioned with our utilities in the low
 
 We use the following JavaScript to trigger our live toast demo:
 
-{{< js-docs name="live-toast" file="site/assets/js/snippets.js" >}}
+{{< js-docs name="live-toast" file="site/assets/js/partials/snippets.js" >}}
 
 ### Translucent
 

site/content/docs/5.3/docsref.md

@@ -46,4 +46,4 @@ sitemap_exclude: true
 
 {{< scss-docs name="variable-gradient" file="scss/_variables.scss" >}}
 
-{{< js-docs name="live-toast" file="site/assets/js/snippets.js" >}}
+{{< js-docs name="live-toast" file="site/assets/js/partials/snippets.js" >}}