GitLab

* use https everywhere

* use https links on the files that are left

Also, removed some broken links and updated redirections.

Switch to normal zsh %F/%f prompt escapes to avoid "eval" and extra variables.
Wrap whole thing in anonymous function so the existing `local`
statements actually work. Then switch '...' to eager "..." so
stuff actually works with local variables. And local-ize the
remaining variables that are used only in prompt construction.

Fixes #2008.