Adapt to major changes in stylesheets and content layout with new mobile html endpoint Wikimedia ZIMs

[Jaifroid]

The switch in mwOffliner to the new mobile html endpoint means that there are significant layout changes, as well as changes to bundled stylesheets. This has effects in the PWA (and WikiMed / Wikivoyage) apps, because the override stylesheets included to switch between mobile and desktop styles are only partially working. Additionally, override code for fixing the details-summary tags needs to be adapted.

None of this is impossible, but it is time-consuming to adjust.

[Jaifroid]

This issue is fixed for Wikivoyage ZIMs with 54c7142 and 2928134. Remaining to do is:

• Transformation to Desktop style
• Testing on non-Wikivoyage ZIM types, when we have such ZIMs

[Jaifroid]

Transform to desktop now fixed with eb2222e.

[Jaifroid]

All issues are currently fixed, but we don't have the final format of Wikimedia ZIMs scraped with the mobile-html REST API, so I'll leave open to monitor.