cleanup of unused submodules

.gitmodules

@@ -1,12 +1,3 @@
-[submodule "components/libwebsockets"]
-	path = components/libwebsockets
-	url = https://github.com/warmcat/libwebsockets.git
-[submodule "components/mbedtls"]
-	path = components/mbedtls
-	url = https://github.com/lws-team/mbedtls.git
-[submodule "components/lws-esp32"]
-	path = components/lws-esp32
-	url = https://github.com/huming2207/lws-esp32.git
 [submodule "components/telnet/libtelnet"]
 	path = components/telnet/libtelnet
 	url = https://github.com/seanmiddleditch/libtelnet