Avoid showing analitics notification more than once

[MasterEnoc]

I usually do not accept cookies in any website and I didn't accept cookies in Devdocs. Devdocs can be really intrusive to show a notifications telling me to accept analytics each time I click a page, this is a silly behavior so I change it to only show one time the analytics notification during each Devdocs session.

I also notice that the cookies and the analytics notifications didn't hide automatically thus I added two seconds to hide them automatically.

Look at the following image showing the notifications generated by devdocs when I did not accept the cookies: