Allow launcher configurations to be contributed easily back to the online Launcher DB

[ReplicaObscura]

The Launcher DB is currently a "dumb" API, it is simply a set of JSON files living in a GitHub repository and served through GitHub Pages.

This is not very sustainable, especially when considering users of Launchpad, which might not have GitHub accounts or be open to creating a PR or an issue, should be able to easily contribute their launcher configurations for the community to make use of.