Pick one email announcement (and style fixes)

[dtKinger]

This PR:

• Removes the 2nd, long-form client announcement that had the bulleted list.
• Includes a hot fix to remove some unwanted whitespace in the MarketingMaterial component. Specifically, it removes the margin-top from the first paragraph, shown in orange here:
• Includes some styleguide changes.

@andrewpaliga if you all agree to remove the 2nd email content (the long one with bulleted list) you can merge this PR. If you're keeping it though, I'll get some of these changes in to fix styles, but don't merge this PR yet.

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit ede64f1):

https://knokd-docs-30d6e--pr23-pick-one-announcemen-5wlf4qv2.web.app

_{(expires Tue, 21 May 2024 17:24:11 GMT)}

_{🔥 via Firebase Hosting GitHub Action 🌎}

_{Sign: f978494da85a939b977aa68b46c167d687814f8a}