Merge pull request #338 from DefangLabs/update-deploy-buttons

Update deploy buttons

Author: raphaeltm

README.md

@@ -1,6 +1,6 @@
 # Node.js & OpenAI
 
-[![1-click-deploy](https://defang.io/deploy-with-defang.png)](https://portal.defang.dev/redirect?url=https%3A%2F%2Fgithub.com%2Fnew%3Ftemplate_name%3Dsample-nodejs-openai-template%26template_owner%3DDefangSamples)
+[![1-click-deploy](https://defang.io/deploy-with-defang.svg)](https://portal.defang.dev/redirect?url=https%3A%2F%2Fgithub.com%2Fnew%3Ftemplate_name%3Dsample-nodejs-openai-template%26template_owner%3DDefangSamples)
 
 ## Setup