Gotify integration

[antoine-prrn]

Hello,

I was looking for a Gotify integration in settings and couldn't find one.
Gotify is a server and client designed to easily send push notifications to your devices without using google play services (https://gotify.net/).

A Gotify integration could be very interesting, similar to telegram or matrix, new entries will be pushed to Gotify. It's pretty simple to integrate (https://gotify.net/docs/pushmsg). I looked at the repository under v2/internal/integration, it seems doable.

I'm not familiar with the Go language or the Miniflux code base but I can manage to come up with a pull request. Otherwise, if someone is more familiar with both and finds this interesting, we can discuss how to integrate it. Also, would it be possible to specify a category for which to send notifications?