Add consistent prefix in Compile Instructions

Compile Instructions specifies using prefix=/usr to install, but not to update-shells, so the /etc/shells file ends up with the wrong path. This specifies using the same prefix change for both, though perhaps you would prefer not the specify the prefix on either?

added 4 commits

• b9e5f6fc...32e0a4ef - 3 commits from branch redox-os:master
• 0bd32c57 - Add consistent prefix in Compile Instructions

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enabled an automatic merge when the pipeline for 0bd32c57 succeeds

Thanks! This will be merged as soon as the pipeline is finished.

merged

mentioned in commit 56ea83ef