[prefers-color-scheme] remove old CDN urls

[romainmenke]

[romainmenke]

All scripts that copy browser scripts for CDN's to the plugin root have been removed.

Only this remains :

plugins/css-prefers-color-scheme 
❯ ls -1 ./dist
browser-global.js
browser-global.js.map
browser.cjs
browser.cjs.map
browser.mjs
browser.mjs.map
index.cjs
index.d.ts
index.mjs