telescope: add gitFiles option

[JudahZF]

This PR adds telescopes git_files picker as a configurable mapping.

Sanity Checking

• [x] I have updated the changelog as per my changes
• [x] I have tested, and self-reviewed my code
• [x] My changes fit guidelines found in hacking nvf
• Style and consistency
  • [x] I ran Alejandra to format my code (nix fmt)
  • [x] My code conforms to the editorconfig configuration of the project
  • [x] My changes are consistent with the rest of the codebase
• If new changes are particularly complex: N/A
  • [x] My code includes comments in particularly complex areas
  • [x] I have added a section in the manual
  • [x] (For breaking changes) I have included a migration guide
• Package(s) built:
  • [x] .#nix (default package)
  • [x] .#maximal
  • [x] .#docs-html (manual, must build)
  • [ ] .#docs-linkcheck (optional, please build if adding links)
• Tested on platform(s)
  • [ ] x86_64-linux
  • [ ] aarch64-linux
  • [ ] x86_64-darwin
  • [x] aarch64-darwin

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[github-actions[bot]]

:rocket: Live preview deployed from 249cabe0c5392c384c82fa9d28d3f49fbeb04266

View it here:

Debug Information

Triggered by: horriblename

HEAD at: telescope_gitFiles

Reruns: 1639

[NotAShelf]

Thank you :)