N°3523 Add accessibility to silo selection and user menu toggler

node_modules/selectize-plugin-a11y/README.md

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+# selectize-plugin-a11y.js
+Selectize-plugin-a11y is a plugin to make Selectize.js accessible as a Combobox.
+
+## Selectize-plugin-a11y – Usage
+
+```html
+<script type="text/javascript" src="selectize.js"></script>
+<script type="text/javascript" src="selectize-plugin-a11y.js"></script>
+<script>
+$(function() {
+    $('select').selectize({
+        plugins: ['selectize-plugin-a11y'],
+        render: {
+            option: function($item, escape) {
+                // Every option must have a unique id
+                return `<div class="option" role="option" id="${$item.text.replace(' ', '')}">${$item.text}</div>`
+            }
+        }
+    });
+</script>
+```
+
+## Pull requests are always welcome
+Any pull request to improve the plugin will be appreciated 😉