Fixed a typo in index.html

Changed `seach` into `search`

index.html

@@ -297,7 +297,7 @@
                         <div class="input-group">
                             <input type="text" name="q" class="form-control" placeholder="Search..."/>
                             <span class="input-group-btn">
-                                <button type='submit' name='seach' id='search-btn' class="btn btn-flat"><i class="fa fa-search"></i></button>
+                                <button type='submit' name='search' id='search-btn' class="btn btn-flat"><i class="fa fa-search"></i></button>
                             </span>
                         </div>
                     </form>
@@ -897,4 +897,4 @@
         <script src="js/AdminLTE/demo.js" type="text/javascript"></script>
 
     </body>
-</html>
+</html>