Newsletter: Additional Style Fixes

[patrickbrown-io]

• Header issues fixed including: Campus logo too small, Website link wrong color, Newsletter title too small, and date and website link should be smaller. Email header too large. Provided correct email header from Lissa ( thanks!). NOTE: Link color SHOULD have all the correct client-specific and dark/light mode overrides being applied to force brand colors... but is not guaranteed to work across all clients equally due to email HTML having zero standards between clients.
• Fixes spacing between border and next articles in a series of Articles or User-content. Previously the top spacing was too small.
• Fixes a footer issue where sometimes the background wouldn't apply and there would present white text on a white background.
• Fixes header images cropping oddly

Resolves #1311
Resolves #1450

[jcsparks]

Not sure I can fully test this one, but it all seems to work for me.