fix: markdown

package.json

@@ -6,12 +6,14 @@
     "copy-to-clipboard": "^3.0.8",
     "fix-orientation": "^1.1.0",
     "gh-pages": "^3.0.0",
+    "html-to-react": "^1.4.3",
     "load-script": "^1.0.0",
     "markdown-it": "^11.0.0",
     "markdown-it-katex": "^2.0.3",
     "pressure": "^2.1.2",
     "react": "^16.9.0",
     "react-dom": "^16.9.0",
+    "react-markdown": "^4.3.1",
     "react-scripts": "^3.1.1",
     "react-timeago": "^4.1.9"
   },