add kalender-test

docs/kalender-test.md

mkdocs.yml

public/ausleihe/index.html

public/cookies/index.html

public/datenschutz/index.html

public/digitallabor/index.html

public/en/ausleihe/index.html

public/en/cookies/index.html

public/en/datenschutz/index.html

public/en/digitallabor/index.html

public/en/feedback/index.html

public/en/kalender-test/index.html

public/en/kontakt/index.html

public/en/ort/index.html

public/en/veranstaltungen/index.html

public/feed_rss_created.xml

public/feed_rss_updated.xml

public/feedback/index.html

public/kalender-test/index.html

public/kontakt/index.html