Jswope00/migrate learner docs

[jswope00]

Working migration for learner docs.

• Adds a "Learner" persona to docs.openedx.org
• Replace edx.org references with Open edX
• Remove ::only syntaxes
• Resolve all reference and linking errors
• migrate images

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[sarina]

Relates to openedx/edx-documentation#2319

[sarina]

I did a pass at removing "edX" specific language. I suspect some of my edits will make the build fail on this PR, and your renaming of many refs will cause the next edx-documentation build to fail. Once this is merged one of us can create a PR like this one: openedx/edx-documentation#2321 and fix all the build errors.