Use free and open chat tools instead of Telegram

[Akselmo]

Likely not a priority but Telegram is not very user friendly due to needing your phone number etc.

Using something like Matrix would be preferrable. Any other options are fine too, I think.

[naveensingh]

Already discussed here: https://github.com/orgs/FossifyOrg/discussions/12

More options will be available soon.