feat(components): add a Markdown component

[zbaylin]

This uses omd's generic markdown parser to generate Markdown using Revery components.

To-do list:

• Blocks:
  • Paragraph
  • List
  • Blockquote
  • Thematic break
  • Heading
  • Code block
  • HTML block (rendered as text)
  • ❌ Tag block
• Inlines:
  • Text
  • Emph
  • Code
  • Hard break
  • Soft break
  • Link
  • Ref
  • HTML (rendered as text)
  • ❌ Tag

[github-actions]

I have updated your lock dirs and formatted the code.
Please @zbaylin pull the last commit before pushing any more changes.

[bryphe]

So cool! Great use of the new FontFamily capabilities

[github-actions]

I have updated your lock dirs and formatted the code.
Please @zbaylin pull the last commit before pushing any more changes.

[OhadRau]

Really cool PR! Just figured I'd drop by and give some feedback since Zach has been showing me all the cool progress the past few days (and trying to keep up with the project since I'd like to contribute some more when I have time 🙃)

Basically just commented on style nitpicks so feel free to get a second opinion on some of these, but I tried to suggest a few things that might make the code a little more idiomatic.

[bryphe]

Just some minor feedback on the names in the SyntaxHighlight module - but otherwise looks great!

[github-actions]

I have updated your lock dirs and formatted the code.
Please @zbaylin pull the last commit before pushing any more changes.