docs: revamp homepage and switch to custom GitHub buttons

- Make the docs English-only by removing all zh-cn content, the language switcher UI, and related JS/config

- Rework homepage feature cards (Safe & Typed, Pure JavaScript, Shopify & Jekyll, Streaming) and refresh section colors/layout

- Replace buttons.github.io with custom Star/Sponsor buttons featuring a live star count and dark-mode support

- Drop the buttons.js script and tidy banner, header, footer, and share partials

Co-authored-by: Cursor <[email protected]>

package.json

@@ -17,7 +17,6 @@
   "scripts": {
     "lint": "eslint \"**/*.mjs\" \"**/*.ts\" .",
     "check": "npm run build && npm run build:docs && npm test && npm run lint && npm run perf:diff",
-    "prepush": "npm run check",
     "test": "jest",
     "test:coverage": "jest --coverage src test/integration",
     "test:e2e": "jest test/e2e",