Merge branch 'fix/handbook-getting-started' into 'master'

[handbook] Fix path of example and add hint to website guide

See merge request !2666
4 jobs for master
Status Name Job ID Coverage
  Trigger
canceled full-dune-2.7-clang

canceled full-dune-2.7-gcc

canceled minimal-dune-2.7-gcc

 
  Downstream Modules
canceled trigger lecture