I support the idea of having different websites dedicated to C2. It helps the community and the userbase grow for Scirra. However, I can agree with Kyatric too.
I'd suggest that make that website, but post all of the free tutorials/plugins/videos/etc here, on the offical site and put a big banner next to them: "Made by this amazing, Construct 2 learning website. You want more? Click here!"
Then on your website, you can link every free content to the Scirra site. So, it would be a cross-link solution.
You have free content on Scirra's site and a link to your webpage. And on your page if someone opens a free content, the user gets directed to the content on the Scirra site. Of course all of the paid content would be on your page exclusively.