ax dashboard is not working outside of ax source code directory

ax dashboard looks for `cmd/ax/web/index.html` but it's not accessible for users who are installing ax via `go install`.

We should label this feature as alpha for now and use it for development purposes.

Start at the dashboard's lookup for `cmd/ax/web/index.html` and inspect how the Go-installed binary accesses that asset. Check the `go install` execution path and the existing dashboard entry point; done means the dashboard works outside the ax source directory and is clearly marked alpha for development use.

Written by the indexing model from the issue text.