🛠️ Chore: Add a "Start Here" button to homepage

[gregmacfarlane]

Detailed Description

@bricegnichols is going to implement a new page for his Learning Pathway #383 write-up. This page would benefit from a big button on the homepage next to the "Table of Contents". It might say something like "New? Start Here."

• [x] Sufficiently defined

[billyc]

@bricegnichols and @gregmacfarlane -- this is straightforward, do you want to publish the page first and then I can add a button to it?

[bricegnichols]

Thanks @billyc! I just published a new page: https://github.com/tfresource/tfresource-website/blob/source/topics/Getting_Started.md