Set Content Widths in Child Themes

[douglas-johnson]

Based on #73 here is my plan

• Expand on the work in https://github.com/thoughtis/cata/tree/0.6.0-beta1 which added theme.json
• Use variables like --wp--custom--content-size in CSS in addition to the editor.
• Update existing block CSS to support the latest block markup in WP 5.8
  • Test whether backward compatibility is necessary.
• In child themes
  • Set font sizes, color palette and gradients in theme.json instead of using add_theme_support
  • Update CSS to use custom properties for width where desired ( we may still need the old widths for some pages, that's OK ).
  • Update CSS for latest block markup.

[douglas-johnson]

First hiccup. Media Queries.

A few of the blocks needs them, specifically: Cover, Media-Text and Columns.

My first thought is to move the responsive bits into the child theme, is there something better?