Add handbook meta link block

[StevenDufresne]

This PR is a follow-up to WordPress/wporg-developer#454.

This block is showing up in multiple different themes. This one for example.

Example usage

Using

<!-- wp:wporg/handbook-meta-link {"heading":"Edit article","linkURL":"//wp.org","linkText":"Improve it on GitHub"} /-->

IMPORTANT

This needs to be merged & deployed together with WordPress/wporg-developer#470.

[ryelle]

Could this be called something more generic? Or is it really necessary as a block? It's just a label + link text, not directly related to site or post meta values, or github. wporg/label-with-link?

Oh, I see the screen reader text now, and the history in WordPress/wporg-developer#388. It's a bummer we need to create a whole block too have that kind of workaround.

Maybe wporg/handbook-link? Though if you do that, you'll want to update filter_article_meta_block in developer too.

Aside from that feedback, the PRs do work as-is.

I am seeing the changelog/improve this links on code reference pages (like https://developer.wordpress.org/reference/functions/block_has_support/), but I think that's true on production to. Is that intentional?

[adamwoodnz]

I am seeing the changelog/improve this links on code reference pages (like https://developer.wordpress.org/reference/functions/block_has_support/), but I think that's true on production to. Is that intentional?

No, looks like a regression 😞

The designs show no meta info at all on code reference.

[renintw]

I am seeing the changelog/improve this links on code reference pages (like https://developer.wordpress.org/reference/functions/block_has_support/), but I think that's true on production to. Is that intentional?

This issue has already been fixed by WordPress/wporg-developer#472.

For this PR, it works as described together with WordPress/wporg-developer#470. 👍

Maybe wporg/handbook-link

It looks like a good idea. Like in the case of the developer, there is this logic determining if a link is a GitHub link. So we might be able to remove the specific mention of GitHub to make it more generic here.

[StevenDufresne]

Alright, I renamed this to wporg/handbook-meta-link and updated the developer PR to match: WordPress/wporg-developer#470

[renintw]

Tested again and looks good to me.