chg: Make clear the captures are public by default

Fix https://github.com/Lookyloo/lookyloo/issues/163

website/web/templates/capture.html

@@ -133,6 +133,8 @@
       {% endfor%}
       <div class="dropdown-divider"></div>
       <center>
+        <b>By default, the capture is public. If you do not want that, untick the box at the top of the form.</b>
+        </br>
         <button type="submit" class="btn btn-info" id="btn-looking">Start looking!</button>
         <div id="long" style="display:none">Please wait, it can take a while on big websites...</div>
         <div id="too-long" style="display:none">... No, really, I mean it.</div>