[Feature] Support P2P data storage #62

With that I mean, supporting things like the git-bug issue storage format, which stores issues inside the git repo, instead (or at least alternative to) storing them in a database. The general idea is, to have projects entirely self-contained within their repo, and thus be truly independent of the platform they are hosted on. In reality today, this is only true for the source code. the whole rest - roughtly "the community" part - is not distributed. This would be a killer feature!