docs: Update Android support page
docs: Update Android support page

- remove Helpouts
- remove Merchant issue reporting link
- remove other dead links
- clean up page code

b\18579472
b\19355066

Change-Id: If55aa57b11604bdd328c55e26ad5bd4ba0b32de7

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base