Using HTML comments in PR template

[benwerd]

Description

No more deleting text from PRs! I'm switching out to using HTML comments.

Checklist:

• 1 PR, 1 purpose: my Pull Request applies to a single purpose
  • This PR only contains configuration changes (package.json, etc.)
  • This PR only contains code changes (if configuration changes are required, do a separate PR first, then re-base)
• My code follows the style guidelines of this project, including naming conventions
• I have commented my code, particularly in hard-to-understand areas
• I have added tests that prove my fix is effective or that my feature works
• If my code adds or changes components, I have written corresponding stories with Storybook
• I have performed a self-review of my own code
• If my code involves visual changes, I am adding applicable screenshots to this thread

[cellog]

Yay!

[akeem]

👍

[cnasc]

Nitpick: markdown link syntax still present, though it will never render as a link because it's in a comment