Add UI for setting result sort order

Author: Chrisvin

extension/options/options.html

@@ -43,6 +43,16 @@
                 </div>
             </fieldset>
             <hr/>
+            <div class="form-group">
+                <strong>Results sort order:</strong>
+                <select class="form-control" name="sort_order" id="sort_order" style="margin-top: 0.5rem;" disabled>
+                    <option value="0">Relevance</option>
+                    <option value="1">Newest</option>
+                    <option value="2">Active</option>
+                    <option value="3">Votes</option>
+              </select>
+            </div>
+            <hr/>
             <fieldset class="form-group">
                 <div class="row">
                     <legend class="col-form-label col-sm-12 pt-0">