vanity: rewrite with templates and external config

Rewrite the program to use external templates and load the configuration
from an external source.

We don't want to blindly send all the requests to some SCM since we want
to support only some modules / program that way.

There's two templates, one for requests coming from a browser, which
list all the supported modules, and one for the `go get` command.

For requests coming from `go get`, we generate a template that indicates
where the repository is.

The external configuration is in YAML, and list all the supported
repositories, and the URL of the repository. It assumes a default VCS
for all the modules (git in our case).

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