Tips
Page not found
Prevent  path from being404/index.html when using permalink: pretty in config.
permalink: /404.html
Hide from sitemap. This is only necessary when using pretty, as it will be ignored normally.
sitemap: false
Custom robots
If you use the Jekyll Sitemap plugin, you will automatically get a robots file on both prod and dev build.
You can create a custom file. The layout must be null otherwise it will use default layout with too much HTML.
---
layout: null
---
User-agent: *
Sitemap: {{ site.url }}/sitemap.xml
You might also need sitemap: false.
Sitemap
Using Jekyll Sitemap plugin, the sitemap.xml file is created on prod and dev builds, but the url in the config will only be used on a prod build. Otherwise it will just be localhost in the sitemap.
Layouts
Set default layout for all pages. Is this needed - isnโt default the default? See artists-portfolio repo.
defaults:
  - scope:
      path: ""
    values:
      layout: "default"
      text_width: true
  - scope:
      path: "index.html"
    values:
      text_width: false
Here, the index.md pages at all levels get certain layout. And everything else defaults to page layout. Anything else is set on a page itself.
defaults:
  - scope:
      path: "**/index.md"
    values:
      layout: "listing"
  - scope:
      path: ""
    values:
      layout: "page"
Markdown in HTML
In a .html layout file, you can use markdownify to turn markdown into HTML.
<footer>
    {{ 'GitHub repo: [MichaelCurrin/cheatsheets ](https://github.com/MichaelCurrin/cheatsheets)' | markdownify }}
</footer>