Adjust layout for This Week in Fluvio newsletter publishing

[tjtelan]

The goal is to be ready for fully automate the delivery of the newsletter on the weeks we publish.

For now, there are a few manual tasks I've been performing that can be fixed with only layout updates and shortcode.

Current process

1. Copy markdown from our simple newsletter preamble, but exclude the subscription call-to-action, and the now hiring banner.
2. Add a horizontal rule
3. Copy rest of post to bottom of file
4. Replace any Hugo shortcodes (Luckily, this is usually only replacing internal link refs with external links)
5. If we are embedding video (so far, only YouTube), rewrite the entire section to be compatible with email, or at least Gmail (See example below)
   • Full title of post, as hyperlink to main YouTube page
   • Hotlink the official YouTube image preview
   • Call to action link to YouTube
6. Copy all that markdown into Buttondown's UI, send draft to myself to verify render and links, then send to all subscribers

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Video markdown rewrite example

This is what took place for This Week in Fluvio 35

Website's video markdown

fluvio-website/content/news/this-week-in-fluvio-0035.md

Lines 26 to 32 in 6817dac

	## New video
	[How to power event driven applications with InfinyOn Cloud](https://www.youtube.com/watch?v=o6sVgSXrOXk)
	<iframe width="640" height="480" src="https://www.youtube.com/embed/o6sVgSXrOXk" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>

---

Newsletter's video markdown

## New Video

[How to power event driven applications with InfinyOn Cloud](https://www.youtube.com/watch?v=o6sVgSXrOXk) 

[![Click image to view on YouTube](https://img.youtube.com/vi/o6sVgSXrOXk/0.jpg)](https://www.youtube.com/watch?v=o6sVgSXrOXk)

[Link to view on YouTube](https://www.youtube.com/watch?v=o6sVgSXrOXk)

[sehz]

Can we add some styling?