chore(env): add deactivate stripe env variable (#2986)

# Description

Please include a summary of the changes and the related issue. Please
also include relevant motivation and context.

## Checklist before requesting a review

Please delete options that are not relevant.

- [ ] My code follows the style guidelines of this project
- [ ] I have performed a self-review of my code
- [ ] I have commented hard-to-understand areas
- [ ] I have ideally added tests that prove my fix is effective or that
my feature works
- [ ] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged

## Screenshots (if appropriate):

.env.example

@@ -39,6 +39,7 @@ CELEBRY_BROKER_QUEUE_NAME=quivr-preview.fifo
 QUIVR_DOMAIN=http://localhost:3000/
 BACKEND_URL=http://localhost:5050
 #COHERE_API_KEY=CHANGE_ME
+DEACTIVATE_STRIPE=true
 
 #RESEND
 RESEND_API_KEY=<change-me>