Sandboxes for homework assignments

I did some throw-away home coding assignments back in the days:

• https://github.com/tot-ra/sandbox-open-time-json
• https://github.com/tot-ra/sandbox-express-axios-api-composition
• https://github.com/tot-ra/sandbox-airport
• https://github.com/tot-ra/sandbox-chocolate-factory
• https://github.com/tot-ra/sandbox-nestjs-auth-ratelimit
• https://github.com/tot-ra/sandbox-guest-book