[mod] rename "default" theme to "legacy"

searx/templates/legacy/categories.html

@@ -0,0 +1,10 @@
+<div id="categories">
+    <div id="categories_container">
+        {% for category in categories %}
+        <div class="checkbox_container">
+             <input type="checkbox" id="checkbox_{{ category|replace(' ', '_') }}" name="category_{{ category }}" {% if category in selected_categories %}checked="checked"{% endif %} /><label for="checkbox_{{ category|replace(' ', '_') }}" class="tooltips">{{ _(category) }}</label>
+        </div>
+        {% endfor %}
+        {% if display_tooltip %}<div class="hidden">{{ _('Click on the magnifier to perform search') }}</div>{% endif %}
+    </div>
+</div>