* Blocks: short-circuit early on sites that do not support blocks
Fixes#430
This is typically only the case for sites using a custom version of WordPress, like ClassicPress.
* let grunt build the markdown
* Check for block support earlier and add filter
One can now deactivate the blocks registered by ActivityPub like so:
```
add_filter( 'activitypub_site_supports_blocks', '__return_false' );
```
* Fix readme (gotta remember to use grunt)
* alias function
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Co-authored-by: Matthias Pfefferle <pfefferle@users.noreply.github.com>
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