Update hosted virtual staining config files for 0.3.0

[ziw-liu]

#153 introduces breaking changes that requires the virtual staining configs hosted on the public HTTP server to be updated. We currently point reviewers to v0.2.1 so we should probably update them later, or we can host configs for both versions?

[edyoshikun]

we will make a new folder under the examples/configs. We will add a text file that ask the users to use the ones in the repo.