Feature landings

[StevenWeathers]

Description

This PR adds landing pages for the primary features (Poker, Retro, Storyboard) and updates the main landing page. Ongoing work to improve feature highlighting and convey all the cool things Thunderdome has to offer agile teams.

TODO:

• [x] finish homepage redesign
• [x] add lightmode screenshots
• [x] test in lightmode

What type of PR is this? (check all applicable)

• [x] 🍕 Feature
• [ ] 🐛 Bug Fix
• [ ] 📝 Documentation Update
• [ ] 🎨 Style
• [ ] 🧑‍💻 Code Refactor
• [ ] 🔥 Performance Improvements
• [ ] ✅ Test
• [ ] 🤖 Build
• [ ] 🔁 CI
• [ ] 📦 Chore (Release)
• [ ] ⏩ Revert

Related Tickets & Documents

Screenshots/Recordings

Steps to QA