Removal of stockfish server

In this session I removed one of the most expensive parts of running DeepPly, which was the stockfish server. Initially, I had batched all stockfish analyses to a cloud server with multiple stockfish instances. To reduce analysis time, I used a persistent position db to store all previously analyzed positions and I had to use a at least 4 cpu core server. Now, the stockfish analysis can be done on the users computer directly, which is how top sites like chess.com and lichess do it. Im done with the django side of it, and will do the client side next session. Also I added django-environ for robust environment variable handling, started using logging library in 2 files as well.