feat(markdown): add gfm support

revert firebase changes

src/components/shared/Markdown.js

@@ -0,0 +1,16 @@
+import React, { memo } from 'react';
+import ReactMarkdown from 'react-markdown';
+import gfm from 'remark-gfm';
+import cx from 'classnames';
+
+const Markdown = ({ children, className, ...props }) => (
+  <ReactMarkdown
+    className={cx('markdown', className)}
+    remarkPlugins={[gfm]}
+    {...props}
+  >
+    {children}
+  </ReactMarkdown>
+);
+
+export default memo(Markdown);