add kde dolphin to connect-page

mentions the specific protocol (webdav/webdavs) to use, #162

copyparty/web/svcs.html

@@ -101,6 +101,7 @@
                 gio mount -a dav{{ s }}://{{ ep }}/{{ rvp }}
                 {%- endif %}
             </pre>
+            <p>on KDE Dolphin, use <code>webdav{{ s }}://{{ ep }}/{{ rvp }}</code></p>
         </div>
 
         <div class="os mac">