Changing the PR template

[psschwei]

We've had a couple of "first time" contributors open PRs recently but get tripped up by the auto PR template.

Given that the vast majority of our PRs seem to fall into the Misc: Bug Fix, New Feature, Documentation Update, Other category, I'm wondering if we ought to consider doing something like:

• dropping the PR body rewrite action and just having a generic PR template
• creating issue templates for the tools, components, requirements, and samplings that capture the current requirements for each of those types