Add shorthand for start, build and serve scripts without theme …

…variant (#365)

package.json

@@ -19,6 +19,7 @@
     "cypress": "start-server-and-test build-and-serve:all '9000|9001|9002' 'cypress run'",
     "cypress:dev": "start-server-and-test start:all '9000|9001|9002' 'cypress open --browser chrome --e2e'",
     "cypress:verify": "cypress verify",
+    "start": "pnpm start:basic",
     "start:basic": "./bin/cli.cjs start --config cypress/projects/basic/playroom.config.js",
     "build:basic": "./bin/cli.cjs build --config cypress/projects/basic/playroom.config.js",
     "serve:basic": "PORT=9000 serve --config ../serve.json --no-request-logging cypress/projects/basic/dist",