Feature #5189 : Automatic vertical scrolling to see directly at the top of the page a FAQ question related to some search results or updates on the FAQ application itself.

This work is the one of Antoine Hedin. I have just created this new PR containing his modifications without the bad commits that were in his PR.

So, https://github.com/Silverpeas/Silverpeas-Components/pull/283 can be closed after that this PR is merged.