I can't open any more my Web Site

Hallo everyone,

I do need your help.

Important: I’m not very good with computer (Beginner) and English is not my own language

My Problem is…
I use DesktopServer and WordPress.org (Enfold Theme) – local on my iMac computer.

Yesterday I decided to clean my Download-Folder
and I removed 3 Folders: “enfold-child” & “themeforest” & “enfold-child.zip”
to another Folder – iCloud Drive

And after this I can’t any more to open my Website http://www.immobilien.dev.cc
I received notification “This Connection is not Private” “Safari warns you when a website has a certificate that is invalid” and also
“Object not found! The requested URL was not found on the server” Error 404

And It’s from DesktopServer “Cannot write preferences with webOwner = root

I don’t know what to do and I really hope that you will help me.
I also can’t any more log me in in WordPress.org and DesktopServer

I don’t know, what happens.

Irina Schröder