add backgrounding option to makefile

[crclark96]

solution to #77

open to clarification of use from @Corb3nik, this should provide a way to run the bot in the background, but the grammar can be changed to whatever feels more comfortable

[Corb3nik]

Seems interesting and way simpler than using tmux/python :D

What do you think @Kileak @Grazfather? I'm not too familiar with Makefiles, but is this the kind of approach we'd like for easy restarting/daemonizing?

[Grazfather]

looks good, but is docker rm necessary? We are running with docker run --rm which should kill the container automatically when we kill it.

[crclark96]

guess i overlooked that

fixed

[Kileak]

What happens to the console and the debug log in "background mode"?

I like the tmux approach pretty much, because it makes it easy to see what's currently happening in the bot and also have the error messages at hand, if something goes bad.

[crclark96]

docker logs otabot