Reword tutorial
Reword "Edit the home page" section
Reword "Add a page" section
Reword "Customize the layout" section
Remove redundant paragraph
Reword "Write pages in Markdown" section
Remove Mr. Mystery fallback
Use frontmatter instead of forematter
Reword first part of "Write some custom code" section
Reword "Use a predefined helper" section
Reword "Next steps" section
Remove extraneous verbiage
Improve admonition handling
Use frontmatter where appropriate
Use proper markup
Remove noise
Use proper formatting
Remove last usage of "should"
Simplify verbiage
Improve admonition styling