ikiwiki includes "Posted" timestamps in some generated web pages

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 541bbe5fd3c1127232ce271041f9dddb94e3f5d7 when one uses cleanall, but this remains to be verified.

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

Original created by @intrigeri on 11987 (Redmine)

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