chore(dev-deps): add eslint config file

_config.yml

@@ -213,7 +213,7 @@ exclude:
   - README.md
   - LICENSE
   - purgecss.js
-  - rollup.config.js
+  - "*.config.js"
   - "package*.json"
 
 jekyll-archives:

eslint.config.js

@@ -0,0 +1,5 @@
+export default [
+  {
+    files: ['_javascript/**/*.js']
+  }
+];