replace tweeting functionality with GitHub Actions

[gr2m]

I think after we do the tweeting via GitHub actions, we can remove all the Azure function logic?

What I would do is to split up the current notify action steps. One step to retrieve the new versions and write it to output, and the other to dispatch the events in all installations. Then we can have a separate step for tweeting

[gr2m]

I think an even better solution would be to create an additional workflow for tweeting, which will act on the nodekitten repository dispatch event type. It would also make a great usage example :)

[gr2m]

@bnb could you install the https://github.com/apps/nodekitten app on this repository, please?

[gr2m]

@bnb ☝🏼

[bnb]

done :)