need to talk updates about learning-resources

[ChristinaB]

I did commit directly to master but I can do a PR if you want and edit the index

[emiliom]

@ChristinaB this is an out-of-the-blue page. In the future you need to tell me exactly where you want it in the structure of the site; otherwise I'm just second guessing your intent, and that's more work for me. Ideally if you're going to be creating new pages and moving existing ones around, please familiarize yourself with site development using mkdoc so you can do everything yourself on your computer, including testing your changes, before submitting the pull request. See instructions on the README file.

I went ahead and added your page under "Overview" in order to implement this now, and b/c I couldn't think of any other location.

I'm sorry, but this new page is way too big for me to offer to do proofreading. In general, please have others proofread your content.

And yes, please submit changes only via pull requests!