Update manifest.json

Author: benjamin-dcs

custom_components/file_plusplus/manifest.json

@@ -3,7 +3,7 @@
     "name": "File++",
     "codeowners": ["@benjamin-dcs"],
     "config_flow": true,
-    "documentation": "https://github.com/benjamin-dcs/File-plusplus/blob/main/README.md",
+    "documentation": "https://github.com/benjamin-dcs/File-plusplus",
     "iot_class": "local_polling",
     "issue_tracker": "https://github.com/benjamin-dcs/File-plusplus/issues",
     "version": "0.1.3"