Add an initial page for animations

Summary: WIP, I want feedback from VDG or whomever

Test Plan: make html

Reviewers: ngraham, ndavis

Reviewed By: ngraham, ndavis

Subscribers: sefaeyeoglu, ngraham, zzag, niccolove

Tags: Goal: Consistency, KDE Human Interface Guidelines, VDG

Differential Revision: https://phabricator.kde.org/D25343