Add guest metadata to all backlog episodes

we have about 80 episodes that need guest metadata added to the markdown files. This is gonna take some time. I think we could get AI to help, but maybe 80 listeners want to take 1 show each?!

Metadata looks like this:

---
number: 666
title: Awesome Podcast
date: 123123123
url: whatever.mp3
---

Under url:, we need to add this for each guest:

the of property is optional, and used if the person is coming from a specific project or company.

guest:
  name: Nicholas Zakas
  of: ESLint
  github: nzakas
  twitter: slicknet
  url: https://humanwhocodes.com/blog/
  # A single social Link. (don't include this comment)
  social: https://someotherplatform.com
  # multiple social Links (don't include this comment)
  social:
  - https://fosstodon.org/@two
  - https://coolmastadon.org/@anotherone

# Multiple Guests look like this:
guest:
  - name: Nicholas Zakas
    of: ESLint
    github: nzakas
    twitter: slicknet
    url: https://humanwhocodes.com/blog/
    social: https://fosstodon.org/@nzakas
  - name: Guest Two
    of: Google
    github: twoooo
    twitter: heheehe
    url: https://cool.com/blog/
    social:
      - https://fosstodon.org/@two
      - https://coolmastadon.org/@anotherone

Here is a list of most/all guest shows:

syntaxfm / website

Add guest metadata to all backlog episodes #1267