Update docs with better config + installation instructions (#300)

* start reworking some documentation

* fuller documentation  + better docs structure

docs/configuration/storage.md

@@ -0,0 +1,45 @@
+# Storage
+
+## Settings
+
+```yaml
+##########################
+##### STORAGE CONFIG #####
+##########################
+
+# Config pertaining to storage of user-created uploads (videos, images, etc).
+storage:
+
+  # String. Type of storage backend to use.
+  # Examples: ["local", "s3"]
+  # Default: "local" (storage on local disk)
+  # NOTE: s3 storage is not yet supported!
+  backend: "local"
+
+  # String. Directory to use as a base path for storing files.
+  # Make sure whatever user/group gotosocial is running as has permission to access
+  # this directly, and create new subdirectories and files with in.
+  # Examples: ["/home/gotosocial/storage", "/opt/gotosocial/datastorage"]
+  # Default: "/gotosocial/storage"
+  basePath: "/gotosocial/storage"
+
+  # String. Protocol to use for serving stored files.
+  # It's very unlikely that you'll need to change this ever, but there might be edge cases.
+  # Examples: ["http", "https"]
+  serveProtocol: "https"
+
+  # String. Host for serving stored files.
+  # If you're using local storage, this should be THE SAME as the value you've set for Host, above.
+  # It should only be a different value if you're serving stored files from a host
+  # other than the one your instance is running on.
+  # Examples: ["localhost", "example.org"]
+  # Default: "localhost" -- you should absolutely change this.
+  serveHost: "localhost"
+
+  # String. Base path for serving stored files. This will be added to serveHost and serveProtocol
+  # to form the prefix url of your stored files. Eg., https://example.org/fileserver/.....
+  # It's unlikely that you will need to change this.
+  # Examples: ["/fileserver", "/media"]
+  # Default: "/fileserver"
+  serveBasePath: "/fileserver"
+```