Adding pygments highlightlng to maven and gradle snippets

[Finishes #55617424]
Merge commit 'ba63e8cdee9bbd4503cf5870f4e95a761e6255e2' into gh-pages

* commit 'ba63e8cdee9bbd4503cf5870f4e95a761e6255e2':
  Adding pygments highlightlng to maven and gradle snippets