cleanup settings (#172)

- closes https://github.com/microsoft/pxt-calliope/issues/170
- deprecates https://github.com/microsoft/pxt-calliope/issues/162
- no changes for https://github.com/microsoft/pxt-calliope/issues/161

Co-authored-by: JW <gitkraken@juriwolf.de>
Co-authored-by: Juri <info@juriwolf.de>

libs/bluetooth/pxt.json

@@ -26,10 +26,6 @@
             }
         },
         "optionalConfig": {
-            "microbit-dal": {
-                "stack_size": 1280,
-                "gatt_table_size": "0x700"
-            }
         },
         "userConfigs": [
         ]