* Docs: explain how to setup the apt repo without helpers

* Docs: re-structured apt install docs

* Update docs/sources/installation/debian.md

Co-Authored-By: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>

* Update docs/sources/installation/debian.md

Co-Authored-By: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>

* Docs: improvements based on feedback

* Docs: appending is safer if the user for some reason wants both beta and non beta

* Docs: repo -> repository

* Update docs/sources/installation/debian.md

Co-Authored-By: Arve Knudsen <arve.knudsen@gmail.com>

* Update docs/sources/installation/debian.md

Co-Authored-By: Arve Knudsen <arve.knudsen@gmail.com>

Co-authored-by: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>
Co-authored-by: Arve Knudsen <arve.knudsen@gmail.com>