feat(docs): Migrate to mdbook

docs/src/common-library/howto/multiple-subpath.md

@@ -0,0 +1,43 @@
+# Multiple subPaths for 1 volume
+
+It is possible to mount multiple subPaths from the same volume to the main
+container. This can be achieved by specifying `subPath` with a list
+instead of a string.
+
+```admonish note
+It is not possible to define `mountPath` at the top level when using this
+feature
+```
+
+## Examples:
+
+```yaml
+persistence:
+  config:
+    enabled: true
+    type: custom
+    volumeSpec:
+      configMap:
+        name: myData
+    subPath:
+      - path: myFirstScript.sh
+        mountPath: /data/myFirstScript.sh
+      - path: myCertificate.pem
+        mountPath: /certs/myCertificate.pem
+        readOnly: true
+```
+
+```yaml
+persistence:
+  config:
+    enabled: true
+    type: pvc
+    existingClaim: myAppData
+    subPath:
+      - path: .
+        mountPath: /my_media
+      - path: Series
+        mountPath: /series
+      - path: Downloads
+        mountPath: /downloads
+```