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/integrations/services/kimai/index.md

@@ -49,6 +49,8 @@ Paste the following block in your `local.yaml` file, after replacing the placeho
 
 To get the value for `x509cert`, go to _System_ > _Certificates_, and download the public Signing Certificate. To avoid further problems, concat it into "string format" using e.g.: https://www.samltool.com/format_x509cert.php
 
+<!-- prettier-ignore-start -->
+
 ```yaml
 # Optionally add this for docker debug-logging
 # monolog:
@@ -127,4 +129,6 @@ kimai:
                     url: "https://kimai.company"
 ```
 
+<!-- prettier-ignore-end -->
+
 Afterwards, either [rebuild the cache](https://www.kimai.org/documentation/cache.html) or restart the docker container.