Use a mobile detection script rather than basing solely on width

**Is your feature request related to a problem? Please describe.**
It's slightly annoying when dolthub changes to the "mobile" version of the page when you have the window too small,

**Describe the solution you'd like**
Check out this site, they have code already written for this issue: http://detectmobilebrowsers.com/

**Describe alternatives you've considered**
Use the user agent or something similar. I know this is all _technically_ bad practice :(

**Additional context**