🎩 What? Why?

This PR implements the Decidim::Votings::ContentBlocks::LandingPage::TimelineCell.

The HTML and CSS code has to be typed/pasted in the edit form from the admin side.

📌 Related Issues

• Related to Manage voting landing page with content blocks #7331
• Related to See a voting landing #7112
• depends on Add Votings landing page layout #7440

Testing

• As a participant, visit a voting details page (the timeline cell should be activated on the Landing page admin side):
  
• As an admin, go to manage the voting LandingPage, edit and activate the timeline block:
  

📋 Checklist

🚨 Please review the guidelines for contributing to this repository.

• ❓ CONSIDER adding a unit test if your PR resolves an issue.
• ✔️ DO check open PR's to avoid duplicates.
• ✔️ DO keep pull requests small so they can be easily reviewed.
• ✔️ DO build locally before pushing.
• ✔️ DO make sure tests pass.
• ✔️ DO make sure any new changes are documented in docs/.
• ✔️ DO add and modify seeds if necessary.
• ✔️ DO add CHANGELOG upgrade notes if required.
• ✔️ DO add to GraphQL API if there are new public fields.
• ✔️ DO add link to MetaDecidim if it's a new feature.
• ❌AVOID breaking the continuous integration build.
• ❌AVOID making significant changes to the overall architecture.

📷 Screenshots

Please add screenshots of the changes you're proposing

♥️ Thank you!