feat: Wrap the searched chunk with a Popover #2247 (#2398)

### What problem does this PR solve?

feat: Wrap the searched chunk with a Popover #2247

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

web/src/pages/search/index.less

@@ -168,3 +168,9 @@
     background-position: 200% center;
   }
 }
+
+.popupMarkdown {
+  width: 60vw;
+  max-height: 40vh;
+  overflow: auto;
+}