The previous default pointed to 'webui-mvp' which is the internal
development repo name and meaningless to anyone deploying the public
repo. Changed to the generic '~/.hermes/webui' which is a sensible
default for any deployment.
The state dir remains fully overridable via HERMES_WEBUI_STATE_DIR
for anyone who wants to run multiple instances side by side.
Co-authored-by: Nathan Esquenazi <nesquena@gmail.com>
123207e0a6