This commit adds a new section to the README.md file, detailing how to detect and secure Sidekiq secrets within an application.
Updated the PR check workflow to comment out the `--exclude-files` option and added a new rule in README.md to ignore placeholder secrets.
Updated the README to comment out the allowlist rule for badge URLs, as it is no longer necessary.
Add `--config-path .gitleaks.toml` to pr-check.yaml and create a new `.gitleaks.toml` file with allowlist and rules for security scanning. Rename 'API utilities' to 'Utilities' in the README.md table.