{modules/system-info,scripts/system_info}: Init HEAD main

This collects relevant information for each host in an informative
markdown file.

An example (generated via `./scripts/system_info.sh`):

    # server2

    ## Virtual Hosts

    etebase.vhack.eu: dav.vhack.eu
    gallery.s-schoeffel.de
    git.foss-syndicate.org
    invidious-router.vhack.eu: video.fosswelt.org invidious-router.sils.li
    issues.foss-syndicate.org
    libreddit.vhack.eu
    redlib.vhack.eu
    source.foss-syndicate.org
    source.vhack.eu

    ## Open ports

    TCP 22: ssh
    TCP 25: mail-smtp
    TCP 80: http
    TCP 443: https
    TCP 465: mail-smtp-tls
    TCP 993: mail-imap-tls
    TCP 995: mail-pop3-tls

    # server3

    ## Virtual Hosts

    b-peetz.de
    mastodon.vhack.eu
    matrix.vhack.eu
    miniflux.foss-syndicate.org: rss.foss-syndicate.org rss.vhack.eu miniflux.vhack.eu
    openpgpkey.b-peetz.de
    openpgpkey.s-schoeffel.de
    openpgpkey.sils.li
    openpgpkey.vhack.eu
    peertube.vhack.eu
    trinitrix.vhack.eu
    vhack.eu

    ## Open ports

    TCP 22: ssh
    TCP 80: http
    TCP 443: https
    TCP 64738: ???

    UDP 64738: ???

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