In order to be able to upgrade to Gutenberg v10.4.0 I needed to make some changes to the Fizzie theme.

I wanted to be able to:

• properly support full and wide width alignment.
• document all the new blocks for Full Site Editing.
• remove some of the override logic that I no longer needed.

Summary of changes

• Added: Add Input Output Debugging custom template, bobbingwide/fizzie#65
• Changed: Improve support for align wide and align full, bobbingwide/fizzie#44
• Changed: Add Header and Footer template variant examples, bobbingwide/fizzie#60
• Changed: Add query-title to archive.html to aid the block’s documentation, bobbingwide/fizzie#60
• Changed: Replace archive_description shortcode by query-title and term-description, bobbingwide/fizzie#60
• Changed: Add .gitignore to ignore custom.css and/or oik-custom.css, bobbingwide/fizzie#57
• Changed: Override nav menu spacing and colour again for Gutenberg 10.3.0, bobbingwide/fizzie#26
• Changed: Set default template part tagName based on template area, bobbingwide/fizzie#55
• Tested: With Gutenberg 10.4.0
• Tested: With WordPress 5.7 and WordPress Multi Site
• Tested: With PHP 8.0

For the full list of changes to the Fizzie theme see bobbingwide/fizzie.