Chore: switch from os.path to pathlib.Path

docs/configuration.md

@@ -404,7 +404,7 @@ set this value to /paperless. No trailing slash!
 #### [`PAPERLESS_STATIC_URL=<path>`](#PAPERLESS_STATIC_URL) {#PAPERLESS_STATIC_URL}
 
 : Override the STATIC_URL here. Unless you're hosting Paperless off a
-specific path like /paperless/, you probably don't need to change this.
+subdomain like /paperless/, you probably don't need to change this.
 If you do change it, be sure to include the trailing slash.
 
     Defaults to "/static/".