v11: Umbraco Marketplace replaces packages repo

[iOvergaard]

This replaces the packages repo in the 'Packages' section and marks the factory ourPackageRepositoryResource as deprecated. We are now showing an iframe with Umbraco Marketplace.

Screenshot of the frontpage of Marketplace:

Interaction with Marketplace + showing the other tabs not being affected:

2022-11-03.at.13.39.47.-.Silver.Lemur.mp4

[ronaldbarendse]

I've added some suggestions to fix minor styling issues and comments.

Regarding the URL that's requested, maybe we should construct the URL based on the installed version, so the Marketplace can redirect to the appropriate page, e.g. https://[dev.]marketplace.umbraco.com/backoffice/[version]?

For now, that could redirect to https://[dev.][marketplace.umbraco.com/?version=[version]&style=backoffice, but allow overriding later. This could also be used to redirect an EOL version to a 'version unsupported' page, etc.

Regarding the additional parameters: adding them to the query string might result in issues with URL lengths and exposing sensitive information (as query strings might end up in HTTP logs, etc.). Maybe a better approach is to post a message to the Marketplace iframe using window.postMessage()?

marketplaceIframe.postMessage({
  "additionalDataKey1": "additionalDataValue1",
  "additionalDataKey2": "additionalDataValue2"
}, "https://[dev.][marketplace.umbraco.com/");