ikiwiki includes "Posted" timestamps in some generated web pages

Originally created by @intrigeri on #11987 (Redmine)

We’ve seen that break reproducibility once. Looks like they come from templates/archivepage.tmpl and/or templates/inlinepage.tmpl.

It might have been fixed by 541bbe5f when one uses cleanall, but this remains to be verified.

Feature Branch: 451f:tails/feature/11987+remove_ikiwiki_timestamps

Edited May 15, 2020 by intrigeri

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