The native Gutenberg "Button" block should be harmonised according to our CSS Styleguide https://planet4.greenpeace.org/styleguide/section-components.html , to avoid over-proliferation of colourful buttons all over p4 sites.

For the Button block please:

• Allow only "Squared" style for now (according to CSS styleguide rules)
• Remove "Colour Settings" for now
• Add 3 new styles according to CSS styleguide:

1. Donate
2. Call To action - primary
3. Call to action - secondary

Please follow the CSS styleguide for styles and colour and if in doubt check with wmorrisj

Please make sure also MENA (left-to-right) is aligned

Tasks

• Hide "Default" and "Outline" styles for button, and leave only the "Squared" option
• Adjust colour palette according to P4 style
• Remove "Color settings" section