Add a custom Jinja filter `image_url` to `app.py` to correctly resolve image paths from object storage or local static files, and update all relevant templates (members, sponsors, competitions, contributors) to use this new filter instead of the `url_for('static', filename=...)` function, ensuring images are displayed correctly regardless of their storage location.
Replit-Commit-Author: Agent
Replit-Commit-Session-Id: cd9a7d26-a4e5-4215-975c-c59f4ed1f06d
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Updates CSS to center content and icons on various pages (competitions, contact, contributors, sponsors) and adjusts horizontal rule styling. Modifies HTML structure in competitions.html for better content organization.
Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 5e584ab0-c340-4432-97ef-1972582b60e9
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