basic patch notes viewer, lazy-load settings and store, build frontend as esmodule, add lazy-loaded react-markdown, backend changes to accomodate ESModule frontend

frontend/src/components/Markdown.tsx

@@ -0,0 +1,9 @@
+import { FunctionComponent } from 'react';
+import ReactMarkdown, { Options as ReactMarkdownOptions } from 'react-markdown';
+import remarkGfm from 'remark-gfm';
+
+const Markdown: FunctionComponent<ReactMarkdownOptions> = (props) => {
+  return <ReactMarkdown remarkPlugins={[remarkGfm]} {...props} />;
+};
+
+export default Markdown;