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- For some reason this CSS animation didn't work on Tor Browser.
- Let's limit the amount of code that we copy and paste.
- APNG doesn't work on every browser but it does on Firefox which is the
  only supported browser for the extension.
- Animated GIT doesn't handle transparency.

Pause on failure is a rare case (mostly a workaround in Tails if I
understand correctly) so maybe it doesn't deserve a sentence of its own
and people could figure out by themselves that they need to click Play
to start again (and if play doesn't work, then check their connectivity).

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Conflicts:
	wiki/src/install/inc/stylesheets/dave.css

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Revert "Revert "Temporarily disable toggles in overview because they break the layout on boum.org (#10793)""

This reverts commit a830d747.

This reverts commit 24bf74e5.

Merge remote-tracking branch 'tchou/web/10848-unsupported-browser' into web/10848-unsupported-browser (Closes: #10848)

Merge branch 'web/10848-unsupported-browser' of https://git-tails.immerda.ch/tails into web/10848-unsupported-browser