docs: update README.md to clarify plugin loading (#125)

clarify plugin loading process when running as a `component` instead of `e2e`.

Co-authored-by: byron wall <[email protected]>

Author: byronwall

README.md

@@ -87,12 +87,16 @@ import { defineConfig } from 'cypress';
 import { initPlugin } from '@frsource/cypress-plugin-visual-regression-diff/plugins';
 
 export default defineConfig({
-  // setupNodeEvents can be defined in either
-  // the e2e or component configuration
+  // initPlugin must be called in the section where it is used: e2e or component
   e2e: {
     setupNodeEvents(on, config) {
       initPlugin(on, config);
     }
+  },
+  component: {
+    setupNodeEvents(on, config) {
+      initPlugin(on, config);
+    }
   }
 });
 ```