Path difference with Kolibri in URL for preview of HTML5 apps

[jamalex]

Observed behavior

There seems to be an inconsistency with how the Studio HTML5 preview and the Kolibri HTML5 renderer link to content:

• Studio preview iframe: https://studio.learningequality.org/zipcontent/f4eecb1b4cba466a32a5444e5a546052.zip/
• Kolibri viewer iframe: https://studio.learningequality.org/content/zipcontent/ae532016cf49ef02f4e1bdf50bd8a758.zip/index.html

So, for example, that means the Kamkalima audio dependencies, which reference ..\..\content\storage\[path], work on Studio, but not on Kolibri.

Expected behavior

Since we can't retroactively control what Kolibri does, since old versions are in the wild, probably best to match its behavior in Studio.

User-facing consequences

Cheffed channels with content dependencies (like Kamkalima) may appear to work when previewed on Studio, but then not work once imported into Kolibri.

[marcellamaki]

Seems potentially related to https://github.com/learningequality/studio/issues/3850