Improve documentation

Link

https://github.com/supabase/supabase/blob/master/DEVELOPERS.md

Describe the problem

The docs on getting started with contributing to supabase are very basic and need some work.

Describe the improvement

Add links to docs, improve getting started docs, add links to where people can ask for help, etc.

When running ./nodebb upgrade, the output should also append to logs/output.log just as it does for ./nodebb start. These logs can be viewed by running ./nodebb log.

Good for beginners, feel free to ask here for tips on getting started.

A new version of pusher/pusher-http-php (6.x) has been released recently.
Currently there are supported only versions up to 5.x.

Current tools docs could be updated to reflect changelog entry regard rtm.start method deprecation for apps created after Nov 30th, 2021.

The page URLs

• https://slack.dev/python-slack-sdk/real_time_messaging.html

Requirements

Please read the [Contributing guidelines](https://github.com/slackapi/python-slack-sdk/