renamed esp32c6 variants, so they are not included in release. added disclaimer about pioarduino builds

variants/lilygo_tlora_c6/platformio.ini

@@ -30,7 +30,7 @@ build_flags =
 build_src_filter = ${esp32c6_base.build_src_filter}
   +<../variants/lilygo_tlora_c6>
 
-[env:LilyGo_Tlora_C6_repeater]
+[env:LilyGo_Tlora_C6_repeater_]
 extends = tlora_c6
 build_src_filter = ${tlora_c6.build_src_filter}
   +<../examples/simple_repeater/*.cpp>
@@ -47,7 +47,7 @@ lib_deps =
   ${tlora_c6.lib_deps}
 ;  ${esp32_ota.lib_deps}
 
-[env:LilyGo_Tlora_C6_room_server]
+[env:LilyGo_Tlora_C6_room_server_]
 extends = tlora_c6
 build_src_filter = ${tlora_c6.build_src_filter}
   +<../examples/simple_room_server>
@@ -64,7 +64,7 @@ lib_deps =
   ${tlora_c6.lib_deps}
 ;  ${esp32_ota.lib_deps}
 
-[env:LilyGo_Tlora_C6_companion_radio_ble]
+[env:LilyGo_Tlora_C6_companion_radio_ble_]
 extends = tlora_c6
 build_flags = ${tlora_c6.build_flags}
   -D MAX_CONTACTS=300