VideoPress: investigate what we are missing to integrate with the most used site builders

The idea is coming from feedback provided by users who were churning because they could not integrate VideoPress into their current site-building flow

Product discussion:
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It may be pretty straightforward, and if that's the case we can tackle it to offer VideoPress in sites using other site builders..

Start with the linked product discussion and the user-churn feedback to identify which site builders and integration gaps are in scope. Define the builders to investigate, the required VideoPress integration for each, and the evidence needed to decide what should be built.

Written by the indexing model from the issue text.