WIP: added more assemblies to include more content on devfile registries

[jc-berger]

Fixes devfile/api#82

I'll be making more PR for each new devfile registry assembly:

1. building a custom devfile registry
2. deploying a devfile registry
3. registry schema

[kowen-rh]

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[openshift-ci]

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[openshift-ci]

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This pull-request has been approved by: jc-berger, robin-owen

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[kowen-rh]

Actually, looking at this again, is there a reason that you include xref:deploying-devfile-registry.adoc[] in nav.adoc in this PR as opposed to #96? I noticed while reviewing #96 that it includes the actual content, but doesn't change the navigation, whereas this PR changes the navigation, but doesn't have the content. It seems oddly split.

[jc-berger]

Closing this PR as all work related to devfile registry will be done in PR #99