[refactor][s]: omit backend=gdocs in url to save space and encode url when passing it to view.
[whitespace][xs]: unindent method in js/view.js.
[#10,view][s]: set html and page title (also reintroduce a navbar for this).
[#18,view][s]: add twitter share this button - fixes #18.
[#23,embed][s]: embed instructions in a modal plus embed query parameter on page (which hides stuff) - fixes #23.