Delete leftover branches

[BD103]

This repository has a few branches that were leftover by maintainers and Bors. Since they are all stale, they can probably be deleted.

• alice-i-cecile-path-*
  • All of these PRs have been merged or closed.
• create-pull-request/patch-8favc9d
  • This PR has been merged in Update Examples Screenshots #1023, originally created by Github Actions.
• 0.13-blog
  • This PR has been merged in 0.13 announcement post #891. Bevy 0.13 is released!
• staging and trying
  • Leftover from when we used Bors.

As far as I am aware, there are only two branches that are actually necessary: main and gh-pages. Please--uh--don't delete these ones. XD

Related issue on Bevy main: bevyengine/bevy#11655

[alice-i-cecile]

Done!

[BD103]

That was fast! Thank you :)