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/install-config/automated-install.mdx

@@ -0,0 +1,37 @@
+---
+title: Automated install
+---
+
+To install authentik automatically (skipping the Out-of-box experience), you can use the following environment variables on the worker container:
+
+### `AUTHENTIK_BOOTSTRAP_PASSWORD`
+
+Configure the default password for the `akadmin` user. Only read on the first startup. Can be used for any flow executor.
+
+### `AUTHENTIK_BOOTSTRAP_TOKEN`
+
+Create a token for the default `akadmin` user. Only read on the first startup. The string you specify for this variable is the token key you can use to authenticate yourself to the API.
+
+### `AUTHENTIK_BOOTSTRAP_EMAIL`
+
+Set the email address for the default `akadmin` user.
+
+## Kubernetes
+
+In the Helm values, set the `akadmin` user password and token:
+
+```yaml
+authentik:
+    bootstrap_token: test
+    bootstrap_password: test
+```
+
+To store the password and token in a secret, use:
+
+```yaml
+envFrom:
+    - secretRef:
+          name: _some-secret_
+```
+
+where _some-secret_ contains the environment variables as in the documentation above.