Add host frontmatter to all episode files

[mattstratton]

This will likely be a manual effort as we have no programmatic way to determine who was the host of which episode.

[mattstratton]

For reference, this is an existing episode frontmatter:

+++
Description = "Bridget discusses Devops Weekly with Gareth Rushgrove."
aliases = ["/105"]
author = "Bridget"
categories = []
date = "2018-03-01T18:55:48-05:00"
episode = "105"
explicit = "yes"
friendly = "devops-weekly"
guests = ["grushgrove"]
images = ["https://www.arresteddevops.com/img/social/fb/devops-weekly.png"]
news_keywords = []
podcast = "https://media.blubrry.com/arresteddevops/content.blubrry.com/arresteddevops/arrested-devops-podcast-episode105.mp3"
podcast_duration = "57:07"
sponsors = ["chef", "datadog"]
tags = []
title = "Devops Weekly with Gareth Rushgrove"
youtube = "C82Mumc5ShE"

+++

This same file should be changed to read:

+++
Description = "Bridget discusses Devops Weekly with Gareth Rushgrove."
aliases = ["/105"]
date = "2018-03-01T18:55:48-05:00"
episode = "105"
explicit = "yes"
guests = ["grushgrove"]
images = ["img/social/fb/devops-weekly.png"]
podcast_file = "arrested-devops-podcast-episode105.mp3"
podcast_duration = "52:04"
title = "Devops Weekly with Gareth Rushgrove"
sponsors = ["chef", "datadog"]
episode_image = "episode/img/devops-weekly.jpg"
episode_banner = "episode/img/devops-weekly-banner.jpg"
+++

[bridgetkromhout]

I think @mattstratton did most of this already. I'm submitting #392 which I think fixes this ticket, but since I'm not entirely clear what other frontmatter might matter, I'll leave it to @mattstratton to resolve it.

[bridgetkromhout]

All the episode files now have a hosts line with at least one host listed. Do we have further changes to make to resolve this issue?

[mattstratton]

Nope! That’ll do it!