Cleanup of known-installs.md (#760)
Cleanup of known-installs.md (#760)

* tabs

* Replace URL/name (as indicated by the TLS certificate of old URL)

* Remove send.uvt.nl. Host does not exist in DNS anymore.

* Add trailing slash - with that the URL redirects to a 404

* Remove path from Cedia.org filesender - they moved to /

* Add trailing slash - with that the URL redirects to a 404

* Explicit hrefs so links are clickable on https://docs.filesender.org/known-installs

* géantification
Veredior/filesender,filesender/filesender,Veredior/filesender,Veredior/filesender,filesender/filesender,filesender/filesender,Veredior/filesender,filesender/filesender,Veredior/filesender,filesender/filesender