Site: Optimize dojo stats and update dashboard layout

[alyssaditroia]

Updates the dojo stats function and updates the stats dashboard to simplify the displayed stats. The get_dojo_stats() function now uses direct SQL queries, removed chart and trend data. The stat dashboard has been redesigned to fit the updated results of the stats function.

(Award logic is unchanged; I do not have any awards data locally)

Backend stats calculation:

• Replaced stats and trend calculation with raw SQL queries for total solves, users, and recent solves.
• Removed chart/trend logic and related.
• Query time reduced from ~800ms to < ~400ms using my local mock data with ~2M solves and 6,000 users.

Frontend dashboard redesign:

• Removed chart and trend display, restructured dashboard to show total solves, challenges, recent solves, unique hackers, and awards.
• Award icons and emojis are now displayed in the dashboard, and the chart component/script is removed.
• Removed duplicate award display from the main dojo page since it is now shown in the dashboard.

UI and styling improvements:

• Updated stat card layout
• Added award styling
• Updated recent activity/award display
• Removed chart/trend styles.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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