refactor(docs): copy Used by from README like financial contributors

Drop data/used-by.json and build-used-by.js; build-contributors.js now extracts USED-BY-BEGIN/END to used-by.swig.

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

docs/package.json

@@ -6,7 +6,7 @@
     "version": "7.3.0"
   },
   "scripts": {
-    "prebuild": "npm --prefix .. run build:contributors && npm --prefix .. run build:used-by",
+    "prebuild": "npm --prefix .. run build:contributors",
     "build": "hexo generate",
     "start": "hexo serve",
     "lint": "eslint .",

docs/themes/navy/languages/en.yml

@@ -16,7 +16,7 @@ index:
     description: 'Organizations and individuals who <a href="https://github.com/sponsors/harttle">sponsor LiquidJS</a>. Thank you!'
   used_by:
     title: Used by
-    description: 'Products and projects running on LiquidJS. <a href="https://github.com/harttle/liquidjs/edit/master/data/used-by.json">Open a PR</a> to add yours.'
+    description: 'Products and projects running on LiquidJS. <a href="https://github.com/harttle/liquidjs/edit/master/README.md">Open a PR</a> to add yours.'
 
 playground:
   title: Playground