Fix smooth scroll and other bugs (#1861)

This PR fixes:

- The wrong clean up of window post message communicators
- The smooth scroll bug in chrome (Fixes Anchor navigation in render view not working #1770)
- Scroll by using touch devices in renderer
- Lazy loading of the editor (code mirror doesn't need to be lazy loaded any more)

src/components/render-page/markdown-document.tsx

@@ -84,7 +84,9 @@ export const MarkdownDocument: React.FC<MarkdownDocumentProps> = ({
       className={`${styles['markdown-document']} ${additionalOuterContainerClasses ?? ''}`}
       ref={internalDocumentRenderPaneRef}
       onScroll={onUserScroll}
-      onMouseEnter={onMakeScrollSource}>
+      data-scroll-element={true}
+      onMouseEnter={onMakeScrollSource}
+      onTouchStart={onMakeScrollSource}>
       <div className={styles['markdown-document-side']} />
       <div className={styles['markdown-document-content']}>
         <InvalidYamlAlert show={!!frontmatterInfo?.frontmatterInvalid} />