Add official login button images (login+hover)

TODO: use them

packages/auth/rollup.config.js

@@ -51,6 +51,8 @@ export default {
             targets: [
                 {src: 'assets/index.html', dest:'dist'},
                 {src: 'assets/favicon.ico', dest:'dist'},
+                {src: 'assets/icon_key_hover_tugprod.png', dest:'dist/local/vpu-auth'},
+                {src: 'assets/icon_key_normal_tugprod.png', dest:'dist/local/vpu-auth'},
                 {src: 'node_modules/material-design-icons-svg/paths/*.json', dest: 'dist/local/vpu-common/icons'},
             ]
         }),