chore: update README image with new Next.js logo (#1599)

* Add readme image with new Next.js logo

* Update README image

* Remove old readme image

Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>

Author: iKristy

README.md

@@ -1,4 +1,4 @@
-![Next.js Runtime](next-on-netlify.png)
+![Next.js Runtime](next-js-runtime.png)
 
 # Next.js Runtime