Fix Maniphest Reports scrolling issues
Summary: Fixes T7099, also picked some new colors. Raphael can bind the graph to a dom element, which resolved the scrolling issue.
Test Plan: Tested scrolling on my laptop, desktop. Seems resolved.
Reviewers: epriestley, btrahan
Reviewed By: btrahan
Subscribers: Korvin, epriestley
Maniphest Tasks: T7099
Differential Revision: https://secure.phabricator.com/D11879