switch to wildcard certificates

[sgratzl]

lets encrypt now support: *.caleydoapp.org

see https://www.heise.de/security/meldung/Let-s-Encrypt-stellt-ab-sofort-Wildcard-Zertifikate-aus-3994552.html

[keckelt]

I wasn't sure how wildcard certificates would work now that we have multiple landing pages running (the standard one, one for ordino.caleydoapp.org, and one for tourguide.caleydoapp.org) so I asked on the let's encrypt forum:
https://community.letsencrypt.org/t/wildcard-for-domain-and-dedicated-certifcate-for-one-subdomain/104206

Update: yes that works