Use a script to auto-generate documentation for the core modules from the manifest file

docs/source/modules/storage.md

@@ -0,0 +1,8 @@
+# Storage Modules
+
+Storage modules are used to store the data extracted from a URL in a persistent location. This can be on your local hard disk, or on a remote server (e.g. S3 or Google Drive).
+
+The default is to store the files downloaded (e.g. images, videos) in a local directory.
+
+```{include} autogen/storage.md
+```