website/docs: Update Docusaurus config. Prep for version picker. (#14401)

* website/docs: Clean up config. Add types.

* website/docs: Format MDX.

* website: Fix build warnings. Lint badges frontmatter.

website/docs/install-config/configuration/configuration.mdx

@@ -17,8 +17,8 @@ All of these variables can be set to values, but you can also use a URI-like for
 
 ## Set your environment variables
 
-import Tabs from "@theme/Tabs";
 import TabItem from "@theme/TabItem";
+import Tabs from "@theme/Tabs";
 
 <Tabs groupId="platform">
   <TabItem value="docker-compose" label="Docker Compose" default>