chore: Switch to neostandard (#60)

* https://github.com/neostandard/neostandard

Author: nfreear

eslint.config.js

@@ -0,0 +1,7 @@
+import neostandard from 'neostandard';
+
+export default neostandard({
+  globals: ['HTMLElement'],
+  ignores: ['_BAK', 'what*', 'out/**'],
+  semi: true,  // Enforce semicolons (like semistandard)
+});