fix: root is not required to read current branch

refactor to use up-to-date mirrors on users branch

deprecate -g

refactor fast track mirror list to include all synced mirrors for branch

update docs/man-page

If conf. is not available on $prefix, .conf from host system is copied to $prefix and normalized to defaults before applying api configuration.
Updated docs to reflect change

If conf. is not available on $prefix, .conf from host system is copied to $prefix and normalized to defaults before applying api configuration.
Updated docs to reflect change

refactored api check
if -S is used with -U branch is not written configuration file

create if not exist

added exit when using -U since updating mirrorlist fails on an empty chroot
updated docs