* [scripts-audit] Remove vcpkg_build_gn
This command has never been used (git log -S"vcpkg_build_gn\("
gives no results outside of the file itself and docs)
and so shrink the public interface surface
* [scripts-audit] gn buildsystem
* format
* oops
* aaaugh
* cr
* [vcpkg docs] Change how documenting port functions works
Instead of using `##`, use comment blocks for documentation.
Also, add some minor docs and change RST -> MD
so we actually get docs generated.
* add CI stuff
* regenerate docs
* fix vcpkg_find_acquire_program to not use _execute_process
