Fixes noto, carbon, cbi, cib, fluent-color, logos, and solar icons silently
falling back to a live api.iconify.design call blocked by the CSP, which
only showed up after a hard refresh once the browser cached a partial
response. nuxt.config.ts now scans content/*.md for every icon collection
actually referenced and bundles it automatically, so a newly introduced
collection only needs npm install, not a manual config edit.
Djeex