Configuration object

User’s should be able to configure the followingL:

style object (for the list item… font, colors, etc)
bool: ignore blank headers (ie, headers with no id’s),
array: list of headers to query from (ie, just h1’s… or h2’s etc)
additional padding to scroll when moving down

Make NPM installable

Prevent glitchy-ness on mouse enter when mouse-exit functionality is happening.

throttle
or have a flag for “active” and prevent mouse-enter things from happening if active is engaged.
is still a little hacky, but works

Move styles.css into injectable js