Update PR template and add issue template

[mxstbr]

Make the PR and issue templates more clear to outside contributors when they come. Note that all of this required/auto-close stuff will be waived for us three and any future employees, and also isn't implemented yet.

Changed PR Template:

<!-- FILL OUT THE BELOW FORM OR YOUR PR WILL BE AUTOMATICALLY CLOSED -->
**Status**
- [ ] WIP
- [ ] Ready for review
- [ ] Needs testing

**Deploy after merge (delete what needn't be deployed)**
- iris (api)
- hyperion (frontend)
- athena
- vulcan
- mercury
- hermes
- chronos
- mobile

**Run database migrations (delete if no migration was added)**
YES

**Release notes for users (delete if codebase-only change)**
-

Added issue template:

<!--
FILL OUT THE FORM BELOW OR THE ISSUE WILL BE AUTO-CLOSED

**Issue Type (check one)**

- [ ] Bug Report
- [ ] Feature Idea
- [ ] Technical Discussion
- [ ] Question (these will be auto-closed, please ask them on Spectrum instead https://spectrum.chat/spectrum/open)
-->

**Description (type any text below)**

[brianlovin]

Nice!!