style: Make sidebar items link full width

[jonathan-richer]

I would like the sidebar links to be full width. It'll make it easier to navigate through the sidebar and also be consistent with the sidebar groups which are full-width. And when I say "full-width", I mean "the available space in the sidebar except the margins."

I have looked through the scss files and I found that this the div parent of the link prevents the expansion of the a element. I have tested changing this line from margin-right: auto; to width: 100%; which fixed this.

I am not sure I understand the need for the margin-right property, so if there is an explanation, please enlighten me.