Consider restructuring Block Registration docs in handbook

[talldan]

Description
The Block Registration page in the handbook is currently quite long and hard to navigate:
https://developer.wordpress.org/block-editor/developers/block-api/block-registration/

I'd like to propose dividing it up into the following pages to make it easier to navigate and find information:

• Block Registration—only include details of registerBlockType and registerBlockCollection. Link to a new Block Configuration page with details of the configuration.
• Block Configuration—Move https://developer.wordpress.org/block-editor/developers/block-api/block-registration/#block-configuration to its own page. Add new subheadings for edit and save and link to the Edit and Save page under those subheadings.
• Transforms—Move https://developer.wordpress.org/block-editor/developers/block-api/block-registration/#transforms-optional to its own new page (but keep a subheading in the Block Configuration page and link to this page from there). Extract Block Transforms into its own handbook page #21734
• Supports—Move https://developer.wordpress.org/block-editor/developers/block-api/block-registration/#supports-optional to its own new page (but keep a subheading in the Block Configuration page and link to this page from there). Add new block supports page to the handbook #25647

[oandregal]

I've landed #21734 that addresses the Block Transforms API.

[talldan]

That's awesome, thanks so much for doing that @nosolosw!

[oandregal]

I've prepared #25647 to extract Block Supports API to its own page.

[talldan]

I'll close this as it's a stale issue, and I think there's been quite a bit of restructuring in the ensuing time.