Simplify toggling / dynamic page loading code

Make it so when a page is rendered the HTML of sections is also
injected. This simplifies our code drastically.

Fix Bug: 65816 in process by binding to standard tried and tested
page-loaded event

Change-Id: I4cc3a9faa323bcc1be0f8597df14ca4f821849e8
Merge "Simplify toggling / dynamic page loading code"