tutor now breaks on project names with dashes, like salix-core

[jurgenvinju]

There is a renaming going on to SalixCore that is not done consistently, leading to eventually to this during yarn build in the rascal-website project. This means that the markdown that was generated during the release of salix-core is broken.

Exhaustive list of all broken links found:

- On source page path = /docs/Packages/SalixCore/API/:
   -> linking to ../../../Packages/SalixCore/API/salix/ (resolved as: /docs/Packages/SalixCore/API/salix/)

    at throwError (/Users/jurgenv/Sites/rascal-website/node_modules/@docusaurus/logger/lib/index.js:76:11)
    at handleBrokenLinks (/Users/jurgenv/Sites/rascal-website/node_modules/@docusaurus/core/lib/server/brokenLinks.js:153:47)
    at async buildLocale (/Users/jurgenv/Sites/rascal-website/node_modules/@docusaurus/core/lib/commands/build.js:177:5)
    at async tryToBuildLocale (/Users/jurgenv/Sites/rascal-website/node_modules/@docusaurus/core/lib/commands/build.js:38:20)
    at async mapAsyncSequential (/Users/jurgenv/Sites/rascal-website/node_modules/@docusaurus/utils/lib/jsUtils.js:34:24)
    at async Command.build (/Users/jurgenv/Sites/rascal-website/node_modules/@docusaurus/core/lib/commands/build.js:73:21)