Grammer: essential fixes for Dotcom launch

[henriqueiamarino]

On this commit, I fixed the following issues commented on #8503:

• Removed the two Headers that didn't make too much sense;
• Removed unused custom spaces;
• Fixed the values for the custom font size presets in the theme.json;
• Removed both bundled images;
• Hopefully, after the CBT save parts/post-meta.html is now internationalized;
• The same is valid for templates/404.html, templates/archive.html, and templates/search.html;
• Listed the templates in the theme.json, including the new comments;
• Fixed the main tags in all the templates;
• Updated info: Tested up to and Requires PHP as needed;
• Added credits for the font Albert Sans;
• Added the required No Results paragraph block;
• Removed duplicated comments in the style.css;
• Fixed the static font sizes on the 404 template using font size presets;
• Removed the unneeded tags.

[github-actions]

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[henriqueiamarino]

• On the last commit, I fixed the Style variation issue;
• Removed the patterns/home.php, patterns/index.php, and patterns/simple-header-with-image.php;
• Fixed the Search block issue on the necessary templates;