Add Javascript to autoscroll the docs sidebar to the currently open docs entry

[ravi-mosaicml]

It would be nice if the sidebar on the docs site autoscrolled down to the currently open page. I think this can be done via some custom javascript.

[hanlint]

yeah agreed this is a bit annoying when trying to look at different method cards, as each time i click on one, the scroll bar goes to the top.

[mvpatel2000]

Closing. Tracking elsewhere as low pri