Modify notmyidea to include class="active" on pages

For the notmyidea template, this adds `{% if pg == page %} class="active"{% endif %}` for pages just like the one for categories, so that when a page is selected its "tab" highlights just like the one for categories does. This mirrors the behavior of the simple template.

Required a bunch of whitespace-only changes to expected rendered output; the only substantive change is at the very bottom of the PR.