Incorrect difficulty level on lessons

Hey Jeffrey,

I just noticed an issue on the lessons page with the difficulty label in the <p class="lesson-list-run-time element

If you take a look at the lesson "StyleCI" on that page you'll notice the difficulty level is "Intermediate" but on the Series page the difficulty label is "Advanced".

It seams like all of the lessons on the lessons page have a difficulty level of "Intermediate". EDIT: At least on the first page

I just wanted to bring this to your attention.

Thanks for all of the awesome content here!