daml assistant should embed/serve SDK documentation

I think this could be done small-ish small steps that each add value, though some may be simple enough that they could be merged:

1. Embed the HTML documentation in the SDK tarball (that may already be the case) and have a command from the assistant to spit it out, e.g. daml docs 0.12.17 --pdf docs.pdf and daml docs 0.12.17 --html some-folder.
2. Have the assistant itself be able to serve the SDK docs (embedded in the tarball) as a web server, as that’s the most convenient way to see HTML files: daml serve-docs --port 6666. If run from a project, pick up the SDK version from the daml.yml file, with cli flag to override.

See #1172 for adding a command to compile the docs of the current project.

In addition to documentation, we could also host a specialized Hoogle instance that includes all the loaded libraries.

[neil-da]

Why not just point people at docs.daml.com? Isn’t that a much easier thing to do? What’s the disadvantage?

[ghost]

Closing this in favor of #1172 due to low general enthusiasm for serving sdk docs locally. (We can always revisit this later.)