website: Use Docusaurus Frontmatter for badges (#12893)

website/docs: Reduce redundant usage of badges. Move badge logic to components.

- Fix JSX class name warning.
- Remove duplicate titles.
- Flesh out `support_level` frontmatter.

website/docs/add-secure-apps/providers/proxy/server_caddy.mdx

@@ -1,17 +1,14 @@
 ---
 title: Caddy
-hide_title: true
 ---
 
 import Tabs from "@theme/Tabs";
 import TabItem from "@theme/TabItem";
-
-# Caddy <span class="badge badge--version">authentik 2022.8+</span>
+import Placeholders from "./__placeholders.md";
+import CaddyStandalone from "./_caddy_standalone.md";
 
 The configuration template shown below apply to both single-application and domain-level forward auth.
 
-import Placeholders from "./__placeholders.md";
-
 <Placeholders />
 
 <Tabs
@@ -21,8 +18,6 @@ import Placeholders from "./__placeholders.md";
   ]}>
   <TabItem value="caddy-standalone">
 
-import CaddyStandalone from "./_caddy_standalone.md";
-
 <CaddyStandalone />
 
   </TabItem>