Improve oik-bbw/github block to be Server Side Rendered

[bobbingwide]

The current version of the GitHub block supports setting of text and background colours and also size.

The block needs to be improved.

Requirements

• Remove the redundant, hardcoded header
• Make the block dynamic using Server Side Rendering rather than generating the [github] shortcode
• Make the block dynamic using JavaScript in the editor and Server Side Rendering in the backend.

Proposed solution

Implementation steps similar to above...

• [x] Attempt to support deprecation
• [x] Remove the redundant, hardcoded header
• [x] Make the block dynamic using Server Side Rendering rather than generating the [github] shortcode
• [x] Make the block dynamic using JavaScript in the editor and Server Side Rendering in the backend.

[bobbingwide]

Make the block dynamic using Server Side Rendering rather than generating the [github] shortcode

I made the change, or so I thought, but got 404's from the render request.

Problem determination

1. Check you've added the dynamic server function

   $args = [ 'render_callback' => 'oik_bob_bing_wide_dynamic_block_github'];

2. Check the block name being requested is the same oik-bbw/github
3. Implement some tracing to see what's happening. Why's it working for oik-bbw/csv
4. Revisit step 1.

   $args = [ 'render_callback' => 'oik_bob_bing_wide_dynamic_block_github'];   
   $registered = register_block_type_from_metadata( __DIR__ .'/src/github' );

5. It would be a good idea to pass $args to the block registration wouldn't it.

Say $args out loud, with a silent s.

[bobbingwide]

Attempt to support deprecation.

I think I did it this time.

Remove the redundant, hardcoded header

The redundant header is still needed for the deprecated version though.

Make the block dynamic using JavaScript in the editor and Server Side Rendering in the backend.

We can now:

• [x] remove the redundant shortcode attribute.
• [x] improve the block's description
• [x] remove the extra single quotes on the block's description.
• [x] improve the block's description
• [x] remove unnecessary CSS

[bobbingwide]

Delivered in v2.2.1.