Allow the navigation header to be sticky for horizontal scrolling #102
Description
When the page has a lot of images and has a horizontal scroll bar, the navigation header doesn't scroll with it. This means that if you want to make changes to what's shown, you have to scroll all the way left to do them.
It took a while but I figured out how to fix that, the hard part was also letting the header row in the table to be vertically sticky at the same time. I've made a PR for this, and also fixed:
- Sticky Labels toggle has issues toggling #100, both issues
- The applyHash function didn't update the HTML styles on the page. So the 'sticky labels' checkbox would be checked but the HTML didn't change to reflect that.