debian: fix alias completion, rename ag and clean up README (#7698)
* Use double quotes to cache value of $apt_pref and $apt_upgr
* Clean up and fix syntax of command checks
* Clean up README and document $apt_pref/$apt_upgr overriding mechanism
* Rename `ag` alias (apt upgrade) to `au`
* Clean up README and fix syntax
Fixes #3686
Fixes #4660
Closes #5906
Co-authored-by: Noah Vesely <fowlslegs@riseup.net>
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