Add obvious "Contact" or "Sign Up" ability to homepage

[erictncabramson]

User Story As a user who wants to use Animl, I want the ability to sign up or create my account, so that I can start using the software!

Acceptance Criteria

• Have call to action button (CTA) that says "Sign Up" and links directly to the interest form (https://forms.office.com/r/KNfJ4FqtXA).
• Add Google Analytics tracking to see how many users click on button.
• [ ] Add timeframe communication to the form. (@erictncabramson )

Other Notes: This will be an MVP to get the sign up form into the wild. We will have future work to 1) investigate level of effort of embedding the form and 2) a more future proof/idealized version of this data collection/flow