Issues with Safari and IE

[aidan-epperly]

Explore page fails to load in IE, and text centering does not always work in Safari.

[LRWeber]

Also related : #330

[hauten]

Now called Visualize, this area of the site is not too bad my phone, though I don't know if this is b/c of Safari or the fact of a mobile device. All the charts load on the main visualize page and popular-repos page. dependencies works pretty well; I can click around the "web" and get results.

The top-level menu dropdowns don't work at all on my phone. I can type in the URL for /dependencies but can't get there from the hamburger menu.

All that said, see comment #330 (comment) re: low % of Safari users. IE must be "unknown" or "others." Vast majority of users are on desktop.