What is the process to upload custom drupal themes to Drupal.org? What is relevance of "PayWithPaytm"?
The Drupal community pages are basically a Wiki done in Drupal.  As such, anyone can get authorized to make changes.  However, like a Wiki, people can add spam like this.  This page was spammed today.

I've reverted the page back to the last revision so it should now be helpful.

Welcome to Drupal.