Form updates

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Minor updates including

• [x] Update MC forms
• [x] Add a form component
• [x] Allow CTA to be translated
• [x] Banner block type is missing twig, try adding the impact block to see
• [x] Add transform CSS to the banner block mini button (eg https://iied.org/our-approach)
• [x] Add not-prose for image margin for img where event is in a collection e.g. https://www.iied.org/barbara-ward-lecture-2024-mafalda-duarte

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All Mailchimp sign up forms have been updated