fix: add Candid/Guidestar widget to CSP

- Add widgets.guidestar.org to img-src directive
- Fixes Candid transparency seal not displaying in footer

Author: jeromehardaway

next.config.js

@@ -63,7 +63,7 @@ const nextConfig = {
                             "default-src 'self'",
                             "script-src 'self' 'unsafe-eval' 'unsafe-inline' https://www.clarity.ms https://va.vercel-scripts.com",
                             "style-src 'self' 'unsafe-inline'",
-                            "img-src 'self' data: blob: https://res.cloudinary.com https://avatars.githubusercontent.com https://cdn.shopify.com",
+                            "img-src 'self' data: blob: https://res.cloudinary.com https://avatars.githubusercontent.com https://cdn.shopify.com https://widgets.guidestar.org",
                             "font-src 'self' data:",
                             "connect-src 'self' https://www.clarity.ms https://vitals.vercel-insights.com https://github.com https://api.github.com https://hashflagswag.myshopify.com https://res.cloudinary.com",
                             "frame-src 'self'",