Replace browse input fields with range sliders

[lukasjelonek]

A tutorial how to implementation of a dual range slider is available here: https://medium.com/@predragdavidovic10/native-dual-range-slider-html-css-javascript-91e778134816

This can replace the current input method for gc, contigs, genome size, ...

At the moment we have no specification on how the server returns the min/max values of these fields. I propose to include it in the search info, either as part of each numeric field, e.g. by adding min/max fields, or by as a separate section with ranges for relevant fields.