EidoGo is two things:
A site (eidogo.com) for refining your Go techniques, viewing games, and sharing games. The source for which is here, at the top level of this repo. It includes server-side PHP code and database data.
An embeddable HTML/CSS/JS SGF viewer. The source for that is in the player directory of this repo. It does not depend on any server-side code or data.