AG-13054 - Sync up scroll positioning code

packages/ag-charts-website/src/pages/[framework]/[pageName].astro

@@ -93,29 +93,7 @@ const descriptionWithSeoTagline = `${description} ${seoTagline}`;
 </Layout>
 
 <script>
-    /**
-     * Retain scroll position between page changes
-     *
-     * Use session storage to store the scroll position and get it on page load
-     */
-    const SCROLL_POSITION_LOCALSTORAGE_KEY = 'docs-scroll-position';
-    // NOTE: Need page nav to be on page on page load (ie, not generated on client side)
-    const NAV_SCROLL_CONTAINER_SELECTOR = '#docs-nav-scroll';
+    import { initNavScrollPositionSync } from '@ag-website-shared/utils/navScrollPosition';
 
-    window.addEventListener('load', () => {
-        const nav = document.querySelector(NAV_SCROLL_CONTAINER_SELECTOR);
-        const top = sessionStorage.getItem(SCROLL_POSITION_LOCALSTORAGE_KEY);
-
-        if (nav && top !== null) {
-            nav.scrollTop = parseInt(top, 10);
-        }
-
-        window.addEventListener('beforeunload', () => {
-            if (!nav) {
-                return;
-            }
-
-            sessionStorage.setItem(SCROLL_POSITION_LOCALSTORAGE_KEY, nav.scrollTop);
-        });
-    });
+    initNavScrollPositionSync();
 </script>