Add information to the notification preview

[djsavvy]

Is your feature request related to a problem? Please describe.

The notifications and message previews for messages from the Github bot are quite minimal, to say the least.

Describe the solution you'd like

It would be awesome if the message cards could have a more detailed preview message. For instance, just the extracted text from the card itself could be useful:

For example, the above card would turn into "org/repo: username pushed 1 new commit to main — commit message".

Obviously sometimes the cards contain more than one commit, etc., but even just having the repo and username in the notification preview would be massively helpful.