Remove docs and schemas submodules

Author: benfrancis

.gitmodules

@@ -1,9 +1,3 @@
-[submodule "schemas"]
-	path = schemas
-	url = https://github.com/WebThingsIO/schemas.git
-[submodule "docs"]
-	path = docs
-	url = https://github.com/WebThingsIO/docs.git
 [submodule "api"]
 	path = api
 	url = https://github.com/WebThingsIO/wot.git