Update email newsletter sign-up flow

[theecrit]

What are you submitting?

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• Bug (something's broken)
• Feature request or improvement
• Content update
• Question
• Other

Description

Currently, visitors to the website access the newsletter sign-up by clicking a link in the footer. This punts them to an external MailChimp sign-up form.

The solution we'd like

• Create a dedicated page containing the sign-up form on-site. Only email address should be required, even if we choose to display additional fields.
• Email archives should be included on the sign-up page for those who want to see an example before signing up.
• Link in footer should point to this page instead (or footer should be redesign to contain a simple version of the form itself).

Thank you!

• Please document your design and tech decisions in your pull request so others can follow along and understand why we've made the decisions we have.
• If you'd like feedback, input, or help, share your thoughts or question in this issue's comments. Anyone is welcome to comment on an issue.