style: Modify markdown styles.

Author: jaywcjlove

src/styles/markdown.less

@@ -92,7 +92,7 @@
     margin-top: 0;
     list-style: initial;
   }
-  blockquote {
+  > blockquote, > blockquote blockquote {
     margin: 0;
     border-left: .25em solid #dfe2e5;
     color: #6a737d;
@@ -112,7 +112,7 @@
     height: 1px;
   }
 
-  table {
+  > table, > blockquote table {
     display: block;
     overflow: auto;
     width: 100%;