Improvements to drone cloning

borg.sh: Fix the error unbound variable $remote_url when bootstrapping

Fix emacs 31.1 warnings

bork.mk: Make sure init.el is tangled before init-build if init.org exists

Make sure init.el is tangled before init-build, optionally allow for verbose output

Ensure native-compilation support can be found in Emacs 30 and refactor slightly

borg-activate: Extend load-path before loading autoloads

borg-build: let-bind borg-compile-function

Fix reference to `init-build` target in docs

borg-initialize: Add macro debug spec