Revert "XWIKI-11595: DutchWebGuidlinesValidator fails to parse HTML5 code."

This reverts commit 298abd134bb711c4bebb23b98bdb21cabe5b6168.

This change is useless since we use JSoup now.
Revert "XWIKI-11595: DutchWebGuidlinesValidator fails to parse HTML5 code."

This reverts commit c11151d627fda3e0785b27a31d2939f98cc4e9c8.

This change is useless sicne we use JSoup.