Resolve "Documentation: utiliser mkdocs (avec l'extension mkdocs-material) plutôt que Sphinx"

docs/source/development/forms.md

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+# Forms and form types
+
+###### Date picker
+
+Class
+   `Chill\MainBundle\Form\Type\ChillDateType`
+Extend
+   `Symfony\Component\Form\Extension\Core\Type\DateType`
+
+Usage :
+
+```
+   use Chill\MainBundle\Form\Type\ChillDateType;
+
+   $builder->add('date' ChillDateType::class);
+```
+
+###### Text editor
+
+Add a text editor (by default).
+
+Class
+   `Chill\MainBundle\Form\Type\ChillTextareaType`
+Options
+   * `disable_editor` to disable text editor