Refine Annotated Timeline Tabs for Mobile

[abriggs-usgs]

Let's refine the looks

[x]- put dates for drop down boxes on mobile
[x]- put titles inside the drop down
[x]- 508 issues with white text on gray background (switch text of non-selected boxes to be dark blue and background to be light grey like the bars)
[x] - Make the methods section match the styles

[abriggs-usgs]

Pull Request - DOI-USGS/gages-through-the-ages#166 This covers the changes requested above. It also uses two checks. First, it check the screen width, this works on everything except Android devices. Second, it uses an NPM package to identify if the user device is mobile, this catches the fringe cases that the first check misses.