docs: move the gh pages config to root

Author: rolandjitsu

docs/_config.yml renamed to _config.yml

@@ -16,7 +16,7 @@
     "streams-api",
     "fetch-streams"
   ],
-  "homepage": "https://github.com/rolandjitsu/react-fetch-streams",
+  "homepage": "https://rolandjitsu.github.io/react-fetch-streams/",
   "license": "MIT",
   "author": {
     "name": "Roland Groza",