Extract `@svizzle/insight` from `dapsboard`

[mindrones]

Dapsboard is already so generic that you can use it with a generic ES instance just by providing endpoints and schemas in .yaml files.

In this sense, should we call this generic tool @svizzle/insight, Dapsboard would just be a package that happens to have @svizzle/insight installed as a dependency and DAPS' .yaml files in the /specs folder.