Document mail forwarding in the offboard template

We are usually setting up forwarding when offboarding, so it should be documented, also we shouldn't keep the forwards around forever.

approved this merge request

mentioned in issue #271 (closed)

approved this merge request

added 145 commits

• b2ca5ab8...c8d1a39a - 144 commits from branch archlinux:master
• b347bdf7 - Document mail forwarding in the offboard template

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enabled an automatic merge when the pipeline for b347bdf7 succeeds

mentioned in commit d98593ad

merged