Update the heroku deployment config

[sainak]

• add support to run the backend along with celery on heroku
• add app specification for database and redis
• update docs

[GeekGawd]

Could you elaborate maybe I can see this issue in my free time.

[mukul-oo7]

Hey @sainak, can I work on this issue?

[ghost]

Hey @rithviknishad can I try out this issue ?

[areebahmeddd]

@sainak Could you elaborate what needs to be done?

Thanks :)

[sainak]

@areebahmeddd refer to these docs https://devcenter.heroku.com/articles/deploying-python