Move to Symfony Flex

The structure changed completely.
Bundles are gone. Everything is flatten in the folder `src`.
I separated import & api controllers to avoid _pollution_ in the main controller folder.

templates/Entry/new_form.html.twig

@@ -0,0 +1,15 @@
+<form class="input-field nav-panel-item nav-panel-add" style="display: none" name="entry" method="post" action="{{ path('new_entry') }}">
+    {% if form_errors(form) %}
+        <span class="black-text">{{ form_errors(form) }}</span>
+    {% endif %}
+    <button type="submit" class="nav-form-button" aria-label="add"><i class="material-icons add" aria-hidden="true"></i></button>
+
+    {% if form_errors(form.url) %}
+        <span class="black-text">{{ form_errors(form.url) }}</span>
+    {% endif %}
+
+    {{ form_widget(form.url, {'attr': {'autocomplete': 'off', 'placeholder': 'entry.new.placeholder'}}) }}
+    <i class="material-icons close" aria-label="clear" role="button"></i>
+
+    {{ form_rest(form) }}
+</form>