[SERIAL][BREAKING] RS232 change to SERIAL GATEWAY (#2008)

Make the RS232 more generic by converting it to a Serial Gateway
Add the capability to decode BLE data coming through Serial

docs/.vuepress/config.js

@@ -35,7 +35,7 @@ module.exports = {
           'setitup/ir',
           'setitup/lora',
           'setitup/gsm',
-          'setitup/rs232',
+          'setitup/serial',
           'setitup/sensors',
           'setitup/actuators'
         ]
@@ -62,7 +62,7 @@ module.exports = {
           'use/ir',
           'use/lora',
           'use/gsm',
-          'use/rs232',
+          'use/serial',
           'use/rfm69',
           'use/sensors',
           'use/actuators',