GitHub issue template tweaks and add PSSA template

[bergmeister]

PR Summary

Enhances PR #1320

• Add PSSA template
• Rename colorization template to start with the same name as the bug template to group bug templates together in the UI
• Use 🌈 emoji in colorization for more awesomeness

PR Checklist

Note: Tick the boxes below that apply to this pull request by putting an x between the square brackets.
Please mark anything not applicable to this PR NA.

• PR has a meaningful title
• Summarized changes
• This PR is ready to merge and is not work in progress
  • If the PR is work in progress, please add the prefix WIP: to the beginning of the title and remove the prefix when the PR is ready
• No emojis were harmed during this PR

@tylerl0706 🦄

[rkeithhill]

Dang! Mentioning @tylerl0706 did not automatically add him as a reviewer. Back to the docs.

[rkeithhill]

Do you know if hyperlink's in the about: field would work? As a convenience it would be nice to click there without having the extra Get Started button click.

[bergmeister]

No, they don't work, I tried in the test repo here once with a plain link and once with a markdown link.
It seems GitHub itself don't have their own website on GitHub so we can't even fix that...

[rkeithhill]

Would you mind removing the @tylerl0706 mention in the PR template. Doesn't seem to automatically add him as a reviewer so no point in having it.

[bergmeister]

Ok. Done. I find it better this way because as someone who does a PR it gives me some progress when I see that someone gets assigned whilst waiting for PR feedback.

[TylerLeonhardt]

LGTM 😀 thanks @bergmeister 🎉