feat: join posts with users and remove hardcoded data

[takanome-dev]

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

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

Description

This pr joins the posts data with the users table and remove hardcoded data in the dashboard. Fixes also a bug where authed users can delete posts that they don't own :bug:

Related Tickets & Documents

Fixes #26

Mobile & Desktop Screenshots/Recordings

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Name	Status	Preview	Comments	Updated (UTC)
blog-with-astro-golang	❌ Failed (Inspect)			Oct 17, 2023 9:39pm