R1:4cb2ec11202e

Update support documentation for modern times

Summary:
Basically similar to D13941 but a little more extreme:

- Really strongly emphasize reproducibility for bug reports, and set users up for rejection if they don't satisfy this.
- Really strongly emphasize problem descriptions for feature requests, and set users up for rejection.
- Get rid of various "please give us feedback"; we get plenty of feedback these days.
- Some modernization tweaks.
- Split the support document into:
- Stuff we…