Tablet styling tweaks

* Make ToC's width auto so that it stays narrow when it can and expands
  if section names are long (consulted with Moiz)
* Every section after second section has extra line above section header
  which should get removed
* Remove vertical line next to section edit icons
* Article title and article action icons should be aligned (currently the
  latter are sitting a little lower than the former on the line)

Bug: 65201

Conflicts:
	less/modules/toc/toc.less
	less/modules/toggle.less

Change-Id: Icae997b844326fa981ab9b8c9dc4b4d036ef6e1e