Print the server IP address instead of a full DNS stamp

Also allow the sdns scheme in api/index.html

cmd/doggo/api/index.html

@@ -49,7 +49,7 @@
             <div class="field">
                 <label for="address">Nameserver address</label>
                 <input id="address" name="address" type="text" placeholder="tcp://your-ip"
-                    required pattern="(tcp|udp|tls|https):\/\/(.*)" />
+                    required pattern="(tcp|udp|tls|https|sdns):\/\/(.*)" />
                 <p class="help">
                     To use different protocols like DOH, DOT etc. refer to the instructions
                     <a href="https://github.com/mr-karan/doggo#transport-options">here</a>.