Docs: new tutorial on converting a frontend data source

[andresmgot]

What this PR does / why we need it:

Based on the content from https://docs.google.com/document/d/1CcYzOJCrAvryzBDxo9kL5NFExZmCYtB3P7e1ihs8Pdo/edit

Which issue(s) this PR fixes:

Fixes #906

Special notes for your reviewer:

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