Add dipesh-rawat to sig-docs-website-owners to approve website code updates

Author: dipesh-rawat

OWNERS_ALIASES

@@ -11,6 +11,7 @@ aliases:
     - nate-double-u
     - sftim
   sig-docs-website-owners: # Admins for overall website
+    - dipesh-rawat
     - divya-mohan0209
     - katcosgrove
     - natalisucks