docs(tutorial): add that the test also creates a controller
docs(tutorial): add formatting

the string literal {{query}} was missing as it was not enclosed into ``
docs(tutorial): mention the controller along the scope
docs(header): replace logo.png with logo.svg

The current logo looks awful on high-density displays.  SVG is a
better choice because it can scale to any resolution without
increasing file size.

Amending #2775 to add support for IE 8 by falling back to existing PNG
with img.onerror

Using relative URLs as directed by @btford and @petebacondarwin.

(commit by Brenton Simpson - @appsforartists)

Closes #2874

Conflicts:

	docs/src/templates/css/docs.css
	docs/src/templates/index.html
fix(location): fix parameter handling on search()