Added numenta.com to Sites built with Gatsby README

[jsfowles]

Added numenta.com to the list of sites built with Gatsby.

I also suggest moving that list to the wiki if possible:

https://github.com/gatsbyjs/gatsby/wiki

Then, link to the new wiki page from the README.

[KyleAMathews]

Sweet site! Congrats on the launch!

The list is getting long :-) The plan is to build a site for Gatsby soonish and at that point most of the README will be moved there.

[KyleAMathews]

I noticed the source is available — if you wanted to link to that as well that'd be great https://github.com/numenta/numenta-web/tree/master/numenta.com

Also this is a pretty sophisticated Gatsby site — would love to debrief with you to see how things went and chat about how Gatsby 1.0 can meet your needs better. Are you in Redwood City much? Happy to meet you there. I noticed you live in SLC — I'll be in Utah actually in a few weeks so could meet up there too. Shoot me an email at mathews.kyle@gmail.com if interested.

[jlengstorf]

Hiya @jsfowles! 👋

This is definitely late, but on behalf of the entire Gatsby community, I wanted to say thank you for being here.

Gatsby is built by awesome people like you. Let us say “thanks” in two ways:

1. We’d like to send you some Gatsby swag. As a token of our appreciation, you can go to the Gatsby Swag Store and log in with your GitHub account to get a coupon code good for one free piece of swag. (We’ve got t-shirts and hats, plus some socks that are really razzing our berries right now.)
2. If you’re not already part of it, we just invited you to join the Gatsby organization on GitHub. This will add you to our team of maintainers. You’ll receive an email shortly asking you to confirm. By joining the team, you’ll be able to label issues, review pull requests, and merge approved pull requests.

If you have questions, please don’t hesitate to reach out to us: tweet at @gatsbyjs and we’ll come a-runnin’.

Thanks again! 💪💜