Noindex search results pages in the block editor handbook

[jonoaldersonwp]

The Block Editor Handbook features a search function; e.g., ​https://developer.wordpress.org/block-editor/?s=cats.

Results pages should include a meta robots tag, with a noindex value.

[coffee2code]

In 9000:

Developer: Output meta tag to prevent indexing of search results pages.

Props jonoaldersonwp, coffee2code.
Fixes #4540.

[coffee2code]

FYI: I've applied this to all search results for DevHub, not just for the Block Editor handbook.