Migrate from flask-rq to vanilla rq

[sandlerben]

We need to specify max_connections or else the apps will break all the time on the heroku free plans. there is no way to do that with flask-rq.

https://github.com/andymccurdy/redis-py#connection-pools

[azie-ginanjar]

@sandlerben could I take on this one?

[sandlerben]

Please!

[azie-ginanjar]

@sandlerben could you share the link to vanilla rq website? Try to search through google but can not find it.

[abhisuri97]

https://github.com/nvie/rq

[azie-ginanjar]

@abhisuri97 thanks a lot