mailchimp signup

[aaaaargZombies]

fixes #9

work done

• adds html form (provided by mailchimp then stripped down)
• POST redirect opens in new tab for success/failure comfirmation
• refactor html / css
• add website TS/bundling (as apposed to JS used to build site by 11ty)

questions / thoughts

• What should final copy be? what I added is a placeholder but could be fine!
• Do we just want email, we could take first name, etc. but the less form filling the better for getting people to do a thing.
• Could look into adding a "tag" for the audience so we know who came from the website.
• A welcome email was mentioned, this needs to be set up on mailchimp but does it need doing before we add this to the website? There's a link to mailchimp's documentation in the issue.

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