This commit brings a big update to the screen.css file, making the homepage + policy popup almost 100% responsive.
Another added feature is in the left sidebar: the currently viewed paragraph's title is now highlighted.
Added a new script with the purpose of getting all headers from a post's content and creating links for them in the left sidebar.
Some div classes have been modified, and a wrapper div has been added to posts because of this new script.
Some minor CSS changes have been made.
