Mobile species filter

[mrtmrt233]

addresses #296

Mobile view now shows species search and locate button, hides address bar

[emillipede]

thank you @mrtmrt233

when I test it, the species buttons are kind of floating in the middle of the toolbar, and the select2 bar sometimes overlaps a little bit with the buttons (see screenshots). the toolbar is also quite tall, but that's a separate issue (#245 / #263)

is it difficult move the leaflet location button the bottom of the map (with the zoom in/out buttons)?

before (testing as iphoneX)

after (testing as iphoneX)

[mrtmrt233]

fixed (I think)

[emillipede]

thank you @mrtmrt233

will you please adjust the margins a little bit, so that the borders on each side of the toolbar look even?

do you know why the placeholder text inside the select2 bar is cut off (even though there's space left inside the bar, the E at the end of "name" isn't visible - see photo - I know that the long species names won't all fit in a mobile phone's window)? the same issue come up with the address search bar, but it wasn't resolved

before (testing as iphoneX):

after (testing as iphoneX):