Add cadence survey modal

[ibarrajo]

Testing out modal for Cadence survey.

Other options are:

• adding a navbar CTA
• integrating uRate
• styling modal to be a smaller widget in the corner

[ibarrajo]

New branch, cadence-next incorporates an announcement feature:

    announcementBar: {
      id: 'survey_announcement',
      content:
        'We are looking to hear your feedback, please fill the <a target="_blank" rel="noopener noreferrer" href="https://www.surveymonkey.com/r/9RL7YX9">Cadence 2024 OSS community survey</a>',
      backgroundColor: '#fafbfc',
      textColor: '#091E42',
      isCloseable: true,
    }