Refactor markdown rendering

components/md-renderer/mdx-components/p.js

@@ -0,0 +1,20 @@
+import styled from 'styled-components';
+
+const P = styled.p`
+  color: inherit;
+  font-size: 16px;
+  font-weight: 400;
+  line-height: 27px;
+  margin: 16px 0;
+  
+  img + em { 
+    text-align: center;
+    color: #666666;
+    font-style: normal;
+    font-size: 14px;
+    margin: 5px 0 10px;
+    display: block;
+  } 
+`;
+
+export default P;