move invokeai.db to ~/invokeai/databases

- The invokeai.db database file has now been moved into
  `INVOKEAIROOT/databases`. Using plural here for possible
  future with more than one database file.

- Removed a few dangling debug messages that appeared during
  testing.

- Rebuilt frontend to test web.

invokeai/app/cli_app.py

@@ -218,7 +218,7 @@ def invoke_cli():
     if config.use_memory_db:
         db_location = ":memory:"
     else:
-        db_location = os.path.join(output_folder, "invokeai.db")
+        db_location = config.db_path
 
     logger.info(f'InvokeAI database location is "{db_location}"')