Remove official libwebsockets repo

.gitmodules

 [submodule "server/libusbx"]
 	path = server/libusbx
 	url = https://github.com/libusbx/libusbx.git
-[submodule "server/libwebsockets"]
-	path = server/libwebsockets
-	url = https://github.com/warmcat/libwebsockets.git
 [submodule "server/rapidjson"]
 	path = server/rapidjson
 	url = https://github.com/Kanma/rapidjson.git

libwebsockets @ 9b8a29f8

-Subproject commit 9b8a29f8ca93b156fe2c760d3940e7ae1ad458ec