remove infcloud (unmaintained since 2015)

- the only source code linked from https://inf-it.com/open-source/clients/infcloud/ is a zip of the 'Latest stable release: version 0.13.1 [2015-09-22]'

README.md

@@ -300,7 +300,6 @@ _See also: [Comparison of CalDAV and CardDAV implementations - Wikipedia](https:
 - [AgenDAV](https://agendav.github.io/agendav/) - Multilanguage CalDAV web client with a rich AJAX interface and shared calendars support. ([Source Code](https://github.com/agendav/agendav)) `GPL-3.0` `PHP`
 - [Bloben](https://bloben.com) - CalDAV web client. ([Demo](https://demo.bloben.com/api/app/v1/auth/login-demo?username=demo&password=Bg8v16a4q7gvC&redirect=https://demo.bloben.com/calendar?demo=true), [Source Code](https://github.com/nibdo/bloben-app)) `AGPL-3.0` `Docker`
 - [EteSync Web](https://www.etesync.com/faq/#web-client) - EteSync's official Web-based client (i.e., their Web app). ([Demo](https://client.etesync.com/), [Source Code](https://github.com/etesync/etesync-web)) `AGPL-3.0` `Javascript`
-- [InfCloud](https://www.inf-it.com/open-source/clients/infcloud/) - Open source CalDAV/CardDAV web client implementation. ([Demo](https://www.inf-it.com/infcloud/), [Source Code](https://www.inf-it.com/InfCloud_0.13.1.zip)) `AGPL-3.0` `Javascript`
 
 
 ### Communication - Custom Communication Systems