Debian package, support of non-flatpak installations, metainfo fixing

Analogous to https://salsa.debian.org/xmpp-team/sms4you/-/commit/6dcf2ccc13d4d2f962fafb96ba9a9ac54ce9fa18.

We also need packages for python-briar-wrapper (python-briar-wrapper!5 (merged)) and briar-headless (briar!1252 (closed)).

Closes #39 (closed)

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changed title from Start Debianization to Create Debian package

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• 3b668bdd - Start Debianization

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mentioned in merge request python-briar-wrapper!5 (merged)

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marked as a Work In Progress

mentioned in merge request briar!1252 (closed)

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• c2396fcf - Start Debianization

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• 30670d8c - Document how to build with meson and ninja

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• 9068a6ae - First building .deb

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• bcf9f028 - Update readme to separate building by source and Debian

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• 425329b2 - Depend on python3-briar-wrapper

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• 098cc308 - Add python3 as dependency

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• 2c6f3155 - Add python3 as dependency

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• 9ad25919 - Add support for non-flatpak installations

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• 1b06e63a - Add support for non-flatpak installations

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