Remove Google analytics requirement for using website

Hi, For those who block traffic to Google analytics, use of the visualizations chart is extremely limited. Please consider fixing this. Many links in the left bar do not load, leading to empty pages, such as this:

![screenshot from 2018-12-04 19-51-03](https://user-images.githubusercontent.com/3892695/49484811-f4c2e500-f7fd-11e8-9e06-cd0e1ee10217.png)