CONTRIBUTOR_STATS.md is out of service

### What is the problem?

CONTRIBUTOR_STATS.md is out of service

### Paste all your error logs here:

n/a

### Paste all relevant code snippets here:

n/a

### What are detailed steps to reproduce this?

1. click https://github.com/blitz-js/blitz/blob/main/CONTRIBUTOR_STATS.md
2. click https://www.apiseven.com/en/contributor-graph?chart=contributorOverTime&repo=blitz-js/blitz
3. get error message on the service provider, which is api7.ai's side, upper right corner shows 'Request Error', and returns no info.

### Run `blitz -v` and paste the output here:

n/a

### Please include below any other applicable logs and screenshots that show your problem:

Open CONTRIBUTOR_STATS.md and follow its linked contributor graph URL to confirm the reported Request Error. Check the repository's current documentation conventions and determine whether the contributor-stats reference can be restored or should be replaced; done means the file no longer directs readers to a non-working service.

Written by the indexing model from the issue text.