Broken links

These links do not seem to be working: 
[Building a parser](https://starlasu.strumenta.com/usecases/building-parser.md)
[Building a code generator](https://starlasu.strumenta.com/usecases/building-codegenerator.md)
[Building a transpiler](https://starlasu.strumenta.com/usecases/building-transpiler.md)