QZ-766 Expose colors under EmailList

[itjhai-qz]

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[linear]

QZ-766 Update the email webview

Update the current email webview as per the new design:

Eg: https://qz.com/emails/daily-brief/2140680/

Figma: https://www.figma.com/file/AbzGRPlLExbQtTpT7STbLr/Email-on-web?node-id=490%3A8969

Figjam: https://www.figma.com/file/pHl7MedNZGdi0Xubp4Df2c/proposed-email-designs-%5Bweb-ux-%26-templates%5D?node-id=2%3A2261

• Current webview renders the html from Sendgrid.

• Instead of rendering html, build the markup based on content blocks. May need to update the graphql method to return blocks on emails.

• These content blocks will also include the short codes that we currently use to render the sponsor/partner content. These need to replaced with actual ad markup.

• Add a email signup module at the bottom of the email for logged out users.

• Add the explainer box as shown below. The copy should be extracted from the email config for the specific list.

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