move nnn configuration to its own file, fixes

zsh/.zprofile

@@ -6,5 +6,15 @@ path+=("$(go env GOPATH)/bin")
 export PATH
 
 source ~/.config/.env
-source ~/.config/.env.system
+# source system specific environment variables
+if [[ -f ~/.config/.system.env ]]; then
+    echo ".system.env"
+    source ~/.config/.system.env
+fi
+# source nnn environment variables
+if [[ -f ~/.config/.nnn.env ]]; then
+    echo ".nnn.env"
+    source ~/.config/.nnn.env
+fi
+
 source "$HOME/.cargo/env"