Remove some unfinished pages

content/gemeinschaft/leitbild.md

content/gemeinschaft/offene-gemeinschaft/index.md

content/gemeinschaft/verein/mitgliedschaft.md

content/infos/digitale-bildung.md

content/infos/digitale-souveraenitaet.md

content/infos/junge-menschen-hackspaces.md

content/infos/verstehbare-werkzeuge.md

content/projekte/hack-n-fun/meine-rechte.md

content/projekte/hack-n-fun/social-media.md

content/projekte/indiedact/_index.md

content/projekte/indiedact/handreichung.md

content/updates/_index.md

content/updates/news.md

content/updates/newsletter.md

content/updates/press.md

content/updates/social.md