Link generation for tutorials and reference pages

[brandenchan]

• Link generation for tutorials and reference pages
  • Change [hardcoded versions](Fix too many links for tutorials and references #196) to dynamic implementation

[brandenchan]

@PiffPaffM said:
"We have for every version of the tutorials and references a list (please see here lib/constants.ts). We use this list to generate pages for each tutorial/references (please see pages/reference/[...slug].tsx and pages/tutorials/[...slug].tsx functions getStaticPaths and getStaticProps). The code in getStaticPaths and getStaticProps needs to be optimized."