…o allow choosing with both space and enter

Use bash builtins instead of external commands while scanning files.

…files to the format `Mirror by <owner>. Hosted in <location>` and show truncated description in `termux_change_repo` in the format `M: <owner>. <location>` so that important parts of description are viewable if terminal columns have a low value like default `60`

Closes #60
Closes #170

Noticed this while developing mirror monitoring - this mirror was
previously anycasted to both New Jersey, US and Luxembourg, but is now
only in New Jersey.

See https://mirror.mwt.me, which redirects to
https://www.matthewthom.as/mirrors/, which says everything is is Newark,
NJ, and this PR comment from its operator[0].

[0] #174 (comment)

In this comment[0], its operator said they are unable to keep operating
it.

[0] #170 (comment)

…rdia.tech removals

Signed-off-by: Kevin Williams <admin@utermux.dev>