Adding new nextra topic

Author: officialrajdeepsingh

topics/nextra/index.md

@@ -0,0 +1,12 @@
+---
+display_name: Nextra
+short_description: Nextra is a simple, powerful and flexible site generation framework built with next.js.
+topic: nextra
+github_url: https://github.com/shuding/nextra
+url: https://nextra.site/
+related: nextjs mdx markdown
+logo: nextra.png
+---
+
+Nextra is a nextjs-based static site generation framework using markdown and MDX. 
+Nextra framework is specially built to create markdown-based documentation and portfolio blogs without coding using MDX and markdown.