Update README, switch to SQLite, and adjust ESLint/perfectionist rules

- Simplified and clarified README structure and content.
- Replaced `mongooseAdapter` with `sqliteAdapter` for database configuration.
- Disabled all `perfectionist` ESLint rules for consistency.
- Updated `billingPlugin` import path in dev config.

eslint.config.js

@@ -27,6 +27,23 @@ export default [
   {
     rules: {
       'no-restricted-exports': 'off',
+      // Disable all perfectionist rules
+      'perfectionist/sort-array-includes': 'off',
+      'perfectionist/sort-classes': 'off',
+      'perfectionist/sort-enums': 'off',
+      'perfectionist/sort-exports': 'off',
+      'perfectionist/sort-imports': 'off',
+      'perfectionist/sort-interfaces': 'off',
+      'perfectionist/sort-jsx-props': 'off',
+      'perfectionist/sort-maps': 'off',
+      'perfectionist/sort-named-exports': 'off',
+      'perfectionist/sort-named-imports': 'off',
+      'perfectionist/sort-object-types': 'off',
+      'perfectionist/sort-objects': 'off',
+      'perfectionist/sort-sets': 'off',
+      'perfectionist/sort-switch-case': 'off',
+      'perfectionist/sort-union-types': 'off',
+      'perfectionist/sort-variable-declarations': 'off',
     },
   },
   {