TT1 blocks: implement new comments block

[MaggieCabrera]

This PR implements the new comments block in TT1 blocks

Before:

After:

In other themes I've made this into a hidden pattern to avoid code repetition, I'm not sure if we should do the same for TT1b. I'm open to suggestions.

[carolinan]

All of this could be done in a follow up PR, or, if you want to continue working on it:

• Yes, the comments area could be a pattern or a template part.
• If we are increasing the minimum required theme version, which I hope, then the templates should be moved to the templates folder
• The page needs some spacing between the content and the comments.

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Comments area of twenty twenty-one: https://wp-themes.com/twentytwentyone/?p=1#comments

Tt1 blocks, before PR: https://wp-themes.com/tt1-blocks/?p=1#comments

[MaggieCabrera]

Yeah I can add those changes to this PR

[MaggieCabrera]

I think that's all the changes!

[carolinan]

Aside: Ha, WP does not understand what to do when there is both a block-templates and a templates folder