kresd_installer: remove deprecated kresd installation steps
The kresd installation how-to was outdated. Kresd is now default on Omnia and new versions are not available for Turris, so it does not make sense to offer this guide anymore.
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The kresd installation how-to was outdated. Kresd is now default on Omnia and new versions are not available for Turris, so it does not make sense to offer this guide anymore.