remove approved extensions

targetconfig.json

@@ -41,7 +41,6 @@
             "MKleinSB/ScrollText",
             "MKleinSB/pxt-calliope-oled96",
             "KitronikLtd/pxt-kitronik-servo-lite",
-            "KitronikLtd/pxt-kitronik-motor-driver",
             "KitronikLtd/pxt-kitronik-I2C-16-servo",
             "KitronikLtd/pxt-kitronik-stopbit",
             "KitronikLtd/pxt-kitronik-lampbit",
@@ -52,7 +51,6 @@
             "KitronikLtd/pxt-kitronik-klef-piano",
             "Tinkertanker/pxt-ir-receiver",
             "Tinkertanker/pxt-iot-environment-kit",
-            "Tinkertanker/pxt-motorbit",
             "Tinkertanker/pxt-realtimeclock-ds1307",
             "Tinkertanker/pxt-tinkercademy-tinker-kit",
             "Tinkertanker/pxt-rotary-encoder-ky040",
@@ -60,14 +58,10 @@
             "Tinkertanker/pxt-oled-ssd1306",
             "Tinkertanker/pxt-range-vl53l0x",
             "Tinkertanker/pxt-continuous-servo",
-            "Tinkertanker/pxt-joystickbit",
-            "Tinkertanker/pxt-robit",
             "Tinkertanker/pxt-smarthome",
             "Tinkertanker/microDriver_SHT2x",
-            "Tinkertanker/pxt-ringbitcar",
             "Tinkertanker/uDriver_PCA9585",
             "Tinkertanker/pxt-alphanumeric-ht16k33",
-            "CoderDojoOlney/pxt-olney",
             "PaulDFoster/pxt-microbit-GY521",
             "chevyng/pxt-ucl-junkrobot",
             "sparkfun/pxt-gator-environment",
@@ -75,7 +69,6 @@
             "mbitfun/pxt-katakana",
             "jdarling/pxt-pca9685",
             "pizayanz/pxt-linebeacon",
-            "sunfounder/pxt-sloth",
             "vengit/pxt-sbrick",
             "Annikken/pxt-Andee",
             "sparkfun/pxt-gator-light",