feat(docs): Migrate to mdbook

docs/src/common-library/add-ons/code-server/index.md

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+# Code Server
+
+The [code-server](https://github.com/cdr/code-server) add-on can be used to
+access and modify persistent volume data in your application. This can be
+useful when you need to edit the persistent volume data, for example with
+Home Assistant.
+
+## Example values
+
+Below is a snippet from a `values.yaml` using the add-on. More configuration
+options can be found in our common chart documentation.
+
+```admonish note
+This example will mount `/config` into the code-server sidecar.
+```
+
+```yaml
+addons:
+  codeserver:
+    enabled: true
+    image:
+      repository: codercom/code-server
+      tag: 3.9.0
+    workingDir: "/config"
+    args:
+    - --auth
+    - "none"
+    - --user-data-dir
+    - "/config/.vscode"
+    - --extensions-dir
+    - "/config/.vscode"
+    ingress:
+      enabled: true
+      annotations:
+        kubernetes.io/ingress.class: "nginx"
+      hosts:
+      - host: app-config.domain.tld
+        paths:
+        - path: /
+          pathType: Prefix
+      tls:
+      - hosts:
+        - app-config.domain.tld
+    volumeMounts:
+    - name: config
+      mountPath: /config
+```

docs/src/common-library/add-ons/index.md

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+# Common library add-ons
+
+The common library chart supplies a few add-ons which are meant to simplify some features
+you might be looking for. These are sidecars that run in the same pod as your
+application you configured it with.