0.5.3 release

[Syakyr]

This PR makes several important changes to deployment methods and CI/CD configurations:

• Fixed a reference to "AML file" to correctly say "YAML file" in documentation
• Fixed the GitHub Pages workflow to use --replay-file instead of --config-file for cookiecutter
• Replaced Gunicorn with Uvicorn for all deployment scenarios (Update Gunicorn instructions #74)
  • Removed all references to Gunicorn across documentation
  • Standardized the Uvicorn command format with explicit parameters (--host, --port, --workers, --app-dir)
  • Updated all code examples in documentation for Linux, macOS, and Windows
• Changed credential handling from cat $VAR > file to echo $VAR > file for both Harbor and GCP credentials (CI/CD guide site section inconsistency #75)
  • Updated GitLab CI/CD variable type from "File" to "variable" in documentation
  • Updated corresponding screenshot for CI/CD variable configuration