feat(repo): remove repo by name + refactors

feat(cli): move 'helm dm' to 'helm server'

fix(*): fix license headers

doc(workflow): fix references to 'dm' commands

* + fix old repo tests for Name addition

doc(chart_format): fix title and intro

This is no longer a proposal, so the intro now reflects that.

Fix backwards link markdown in README

* + fix addRepo

* also added name as arg in helm repo add cmd

Third round of refactoring for Manager

Write some new unit tests for expandybird

Fix expandybird Python importing to be lazy

This avoids the following bug:
template/main.py
template/z.py

main.py imports templates.z

Some nice cleanups now that pkg/registry is no longer needed