Update documentation for mazer and collections (here, galaxy docs, etc)

[alikins]

Update mazer related documentation for mazer 1.0, collections, etc.

https://github.com/ansible/galaxy/pull/1788/files covers most of this already

• [x] collections
  • [x] galaxy.yml
  • [x] dependencies
  • [x] semver
  • [ ] artifact format
• [x] build and publish
  • [x] mazer build
  • [x] mazer publish
• [x] lockfiles
• [ ] list format options
  • [ ] --full

[ironfroggy]

Can we include a link to the docs "Required Fields:" section, which stipulates namespace rules, in the error messages that come up when a build fails for violating said rules? I've also commented on that PR to clarify the names must be lowercase and to specify a workaround for users with existing invalid namespaces.

[alikins]

Related: https://github.com/ansible/galaxy/pull/1835/