Doc: Tips on how to move around Linux kernel upgrade

See merge request tails/tails!624

... and move around debian info pages

life shines when you can avoid boring tasks

wiki/src/doc/about/openpgp_keys.ar.po: updating as wiki/src/doc/about/openpgp_keys.de.po has changed.
wiki/src/doc/about/openpgp_keys.ca.po: updating as wiki/src/doc/about/openpgp_keys.de.po has changed.
wiki/src/doc/about/openpgp_keys.fa.po: updating as wiki/src/doc/about/openpgp_keys.de.po has changed.
wiki/src/doc/about/openpgp_keys.id.po: updating as wiki/src/doc/about/openpgp_keys.de.po has changed.
wiki/src/doc/about/openpgp_keys.pl.po: updating as wiki/src/doc/about/openpgp_keys.de.po has changed.
wiki/src/doc/about/openpgp_keys.sr_Latn.po: updating as wiki/src/doc/about/openpgp_keys.de.po has changed.
wiki/src/doc/about/openpgp_keys.tr.po: updating as wiki/src/doc/about/openpgp_keys.de.po has changed.
wiki/src/doc/about/openpgp_keys.zh.po: updating as wiki/src/doc/about/openpgp_keys.de.po has changed.
wiki/src/doc/about/openpgp_keys.zh_TW.po: updating as wiki/src/doc/about/openpgp_keys.de.po has changed.

Update our signing key, 2021 edition

See merge request tails/tails!627

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