(almost) all HTML pages updated: Moved <h1>s outside of the ivle-padding div. Added new <h1>s to pages which didn't have any, and reduced <h1s> down to <h2s> if they didn't represent the page heading.
h1s now represent the top-level heading of a page. The new style sheet styles them specially, designed to appear directly underneath the tab bar. Therefore, they need to appear outside of any padding.
util.py: Removed the <h1> from the default-generated terms of service page. (All other TOS pages should follow). There is now a <h1> at the top of the TOS template page instead.