Update PPA badge

[reiichi001]

This should not go in a future changelog

[Maia-Everett]

PPA maintainer here — yes please! The readme is very outdated, it still pretends PPA is on 1.0.5.

[reiichi001]

Repology doesn't support PPAs and IMG Shields doesn't seem to have something generative we can use, but if there's another badge site that can pull it from config, we can definitely edit that in instead.

[Maia-Everett]

Launchpad has a JSON API to query PPA packages, here's a query for the latest package version published for Ubuntu 22.04 LTS:

https://launchpad.net/api/1.0/~linneris/+archive/xivlauncher-core-stable?ws.op=getPublishedBinaries&status=Published&distro_arch_series=https://launchpad.net/api/1.0/ubuntu/jammy/amd64

Here's the dynamic badge:

https://img.shields.io/badge/dynamic/json?url=https%3A%2F%2Flaunchpad.net%2Fapi%2F1.0%2F~linneris%2F%2Barchive%2Fxivlauncher-core-stable%3Fws.op%3DgetPublishedBinaries%26status%3DPublished%26distro_arch_series%3Dhttps%3A%2F%2Flaunchpad.net%2Fapi%2F1.0%2Fubuntu%2Fjammy%2Famd64&query=%24.entries%5B0%5D.binary_package_version&logo=ubuntu&label=PPA&color=brightgreen

Edit: switched from green to brightgreen

[reiichi001]

Oh. Excellent. I'll update the PR with this so we should be covered for the rest of time!