Fix link to source

The URLs contained an extra `clippy_lints`, which resulted in
broken links. Links are generated using each lint's `id_location`,
which already contains the full path inside the repository.

Author: ageorgou

util/gh-pages/index_template.html

@@ -186,7 +186,7 @@ <h2 class="panel-title"> {# #}
                             {# Jump to source #}
                             {% if let Some(id_location) = lint.id_location %}
                                 <div class="lint-additional-info-item"> {# #}
-                                    <a href="https://github.com/rust-lang/rust-clippy/blob/master/clippy_lints/{{id_location}}">View Source</a> {# #}
+                                    <a href="https://github.com/rust-lang/rust-clippy/blob/master/{{id_location}}">View Source</a> {# #}
                                 </div>
                             {% endif %}
                         </div> {# #}