Modpack builder preview

What's new

• Create modpack flow at /modpacks/new (work in progress)
• Changelog page powered by markdown files in content/changelog/
• Footer link to Changelog for release notes

Improvements

• Dark theme styling for Clerk sign-in and social buttons
• Homepage featured mods load real CurseForge artwork

Fixes

• Hero banner no longer collapses to zero height on load
• CurseForge API key no longer breaks when $ is present in .env