Decentralized & Self Hosted Repositories (Nests)

[Azathothas]

I have completed the backend/infra & docs:
https://docs.pkgforge.dev/repositories/nests#workflow

Test repos exist at:

• https://github.com/pkgforge-dev/ghostty-appimage/releases/tag/soar-nest
• https://github.com/pkgforge-dev/dwarfs-test/releases/tag/soar-nest
• https://github.com/pkgforge-dev/busybox-test/releases/tag/soar-nest

Adding this feature would make soar decentralized as anyone can now self-host their own nests and not be required to use ours
Other than decentralization, would also allow people to push updates faster, for instance @psadi's ghostty-appimage

Once added Readme needs update

| ◆ **Decentralized** |
| Users can use soar completely independent of any of our core infra. Similar to homebrew's taps, Soar has Self Hosted Repositories called [nests](https://docs.pkgforge.dev/repositories/nests). Additionally, users can download any of our packages without using soar and then use another package manager to install them. |