Updated TODO list.
Reduce heading sizes in teasers on home page.
Added clickable heading links

While viewing a post, when you hover over a heading, a pilcrow (paragraph
marker) will appear. Clicking on it scrolls the page to that heading.

This makes it easy to link to a particular section of a page.

- Originally, it was scrolling too far -- due to the fixed navbar and the
  body padding. Fixed.
- Used some Javascript to add the links automatically (since they come directly
  from the markdown rendering).
- Added CSS to display the pilcrows.

Links:

- http://cweiske.de/tagebuch/html-heading-links.htm