Fix link in README.md and fix CI permission

[n0vad3v]

1. Fix broken link, solves Readme broken link #298
2. Tries to fix CI permission, should solve the following error on https://github.com/webp-sh/webp_server_go/actions/runs/6965273052/job/18953708191

Run thollander/actions-comment-pull-request@v2
  with:
    message: 
  
  ghcr.io/webp-sh/webp_server_go (debian 1[2](https://github.com/webp-sh/webp_server_go/actions/runs/6965273052/job/18953708191#step:9:2).2)
  ============================================
  Total: 0 (HIGH: 0, CRITICAL: 0)
  
  
    GITHUB_TOKEN: ***
    mode: upsert
    create_if_not_exists: true
Error: Resource not accessible by integration

[github-actions]

ghcr.io/webp-sh/webp_server_go (debian 12.2)
============================================
Total: 0 (HIGH: 0, CRITICAL: 0)

[github-actions]

ghcr.io/webp-sh/webp_server_go (debian 12.2)
============================================
Total: 0 (HIGH: 0, CRITICAL: 0)