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

docs/source/bundles/event.md

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+Permission is granted to copy, distribute and/or modify this document
+   under the terms of the GNU Free Documentation License, Version 1.3
+   or any later version published by the Free Software Foundation;
+   with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.
+   A copy of the license is included in the section entitled "GNU
+   Free Documentation License".
+
+# Event bundle
+
+## Template & Menu
+
+The event bundle has a special template with a specific menu for actions on
+events. This menu is called `event`.
+
+### ChillEventBundle::layout.html.twig
+
+This layout extends `ChillMainBundle::layoutWithVerticalMenu.html.twig` and add the menu `event`
+
+It proposes a new block :
+
+* event_content
+
+  * where to display content relative to the event.