[mastermind] Fix reset lamps being red and two other bugs

* "reset" lamps being red
* off-by-one bug when responses are updated
* weird delays due to the synchronous lamp server communications
[mastermind] Use white and cyan for responses instead of red and blue
[config] Disable logo
Merge branch 'master' of https://github.com/smab/playhouse-web

Conflicts:
	src/games/mastermind.py
[mastermind] use white and flashing white for responses