This PR updates the system requirements in the docs to note that Linux and Windows can be built from source. This matches the messaging we have in place on the [download page](https://zed.dev/download). Release Notes: - N/A
Move all docs to zed repo Release Notes: - N/A --------- Co-authored-by: Marshall Bowers <elliott.codes@gmail.com> Co-authored-by: Marshall <marshall@zed.dev>