Merge branch 'develop' into contributing-guide

Author: anikethsaha

.codesandbox/ci.json

@@ -0,0 +1,4 @@
+{
+  "sandboxes": ["2d17z"],
+  "packages": [".", "packages/docsify-server-renderer"]
+}

index.html

@@ -80,6 +80,7 @@
   </script>
   <script src="/lib/docsify.js"></script>
   <script src="/lib/plugins/search.js"></script>
+  <script src="/lib/plugins/emoji.js"></script>
   <script src="/lib/plugins/front-matter.js"></script>
   <script src="//unpkg.com/prismjs/components/prism-bash.min.js"></script>
   <script src="//unpkg.com/prismjs/components/prism-markdown.min.js"></script>