Add banner for the leadership summit

[kjaymiller]

We need to add a banner for the Leadership Summit on the homepage that way as we start doing a large push on social media, anyone that comes to the website will be able to find the page quickly and easily.

This would be a banner at the top using the <article></article> tags at the front.

We can use some text like

Join us in Durham, and Online this weekend for the Leadership Summit. Learn More!

[bboyjamba]

I'll take this one.