Fix rendering on yaml frontmatters in readme preview

[pomdtr]

If your write a frontmatter in your readme

---
title: Example
description: demonstration of the problem
---

Example frontmatter

You get this:

Frontmatter could be a good place to add metadata for vals. Example usecase:

• adding title and description to bookmarklets: https://bookmarkl.ink/
• adding license to vals: https://www.val.town/v/vladimyr/licenseBadge
• adding title / favicons to blog posts: https://www.val.town/v/pomdtr/exampleArticle
• val tags

[tmcw]

What would be the ideal rendering of yaml frontmatter? GitHub shows it as a table with headers for each key

Or we could hide it entirely, if it's meant to be metadata only.

[pomdtr]

I think displaying it would be better, but I'm not fan about the table view of github.

A vertical property list works better in my opinion (ex: in obsidian)

[tmcw]

We just shipped visible frontmatter!