Limit creation of new issues and clarify bug report process

[browniebroke]

Description

As follow up from #9660, limit new issue creation and clarify process for reporting bugs.

This is how it looks:

[auvipy]

lets have some more eyes on this before we merge

[johnthagen]

First off, thanks for all the great work that has gone into DRF! ❤️

Just wanted to add a viewpoint as user of DRF. It was shocking/worrying when the issues and discussions were hidden wholesale earlier (see some comments here: https://github.com/orgs/encode/discussions/11). It signaled to me not this project wasn't just "done" (the intention) but felt more like "dead". I worried that if new users came to DRF and saw that state, they would be turned away and thus the project would slowly lose relevance and activity.

I'm glad to see that this has been reverted.

I wanted to share my recommendation this insight that whatever state this lands on, that it still allows users to easier report/discuss issues as it has a big impact on how the project is viewed.