PR: Sticky Menu Mobile UX - First Section Open by Default (#817)

* Update styling for sticky menu to match default section's width
- improve scroll's computing and behaviour

* Keep first collapsed section open on mobile

* Update changelog

* Fix typo, add class to editor view

Author: tibiii

build/blocks/sticky-menu/index.asset.php

@@ -1 +1 @@
-<?php return array('dependencies' => array('react-jsx-runtime', 'wp-block-editor', 'wp-blocks', 'wp-data', 'wp-element', 'wp-i18n'), 'version' => '13d96dfe8887ae4aa73f');
+<?php return array('dependencies' => array('react-jsx-runtime', 'wp-block-editor', 'wp-blocks', 'wp-data', 'wp-element', 'wp-i18n'), 'version' => '601d359713183558912f');

build/blocks/sticky-menu/index.js

@@ -1 +1 @@
-<?php return array('dependencies' => array(), 'version' => 'ddb73b0400ce838ed521');
+<?php return array('dependencies' => array(), 'version' => 'cf51a72123735683e0ba');