Remove site if it exists

src/freedombone-app-jitsi

     apt-get -yq install jitsi-meet jitsi-meet-prosody
 
     jitsi_nginx_site=/etc/nginx/sites-available/${JITSI_DOMAIN_NAME}.conf
+    if [ -f $jitsi_nginx_site ]; then
+        rm $jitsi_nginx_site
+    fi
     if [[ $ONION_ONLY == "no" ]]; then
         function_check nginx_http_redirect
         nginx_http_redirect $JITSI_DOMAIN_NAME