fix(sidebar): hide release_notes directory from autogenerated sidebar

With autogenerated sidebars, Docusaurus creates a separate category
entry for the release_notes/ directory in addition to the
release_notes.md page. This results in a duplicate and broken
"release_notes" entry in the navigation menu.

Add a custom sidebarItemsGenerator that filters out the release_notes
directory category while keeping the individual pages accessible via
links in the Release notes index page.

Signed-off-by: Marco Nenciarini <marco.nenciarini@enterprisedb.com>

Author: mnencia

website/docusaurus.config.ts

@@ -50,6 +50,15 @@ const config: Config = {
           includeCurrentVersion: true, // Include the current version in the sidebar
           lastVersion: lastVersion,
           versions: versionsConfig,
+          async sidebarItemsGenerator({defaultSidebarItemsGenerator, ...args}) {
+            const items = await defaultSidebarItemsGenerator(args);
+            // Remove the release_notes directory category from the sidebar.
+            // Individual release note pages are still accessible via links
+            // in the release_notes.md index page.
+            return items.filter(
+              (item) => !(item.type === 'category' && item.label === 'release_notes'),
+            );
+          },
         },
         blog: false,
         theme: {