Show comment counts on the index page

Moved the <article> tags to outside of _post.tpl so the "X comments"
link could be inside the article. I guess it would also work to put the
empty <a> inside _post.tpl, but this seems cleaner.
Fix a link to the comments

This would work fine while you were viewing the post singly, but on the
index page it was no good.
Set a max width for posts

On very wide monitors the existing layout resulted in very wide
paragraphs, which are hard to read. The max-width ensures the posts
don't get too wide, while `margin-{right,left}: auto` keeps them
centered when they hit max-width.

Also increased the text size a little to further ameliorate wide
paragraphs.
Spacing adjustments

Shorter footer, right-side padding in posts, and fixed the top-padding
on post titles so it actually applies
Display updates

* taller line-height for easier reading
* Promote post titles to h2 to better highlight them
* Demote inline section headers to h3
* Serifs everywhere, serifs all over the place
Prague day 1
Remove non-ascii characters

These worked fine locally but not on production. I really need to
resolve the GHC version discrepancy :\
Prague trip, day 2
Prague day 3
Add gray rectangles to tagged posts [#3]

Also added "N comments" links to the bottom of them, following up on
work done in 8a21ca3a46a874fbd67c0a0bf9d0d4c6c2ce0cfc.
Prague Day 4
Prague Day 5
Fix a typo
Prague Day 6
Smaller blockquotes and bolder h4s
Everything I know about writing tests
Alternative syntaces for ruby's `rescue`
Syntax-highlight code snippets
 Merge branch 'syntax-highlighting' into 'master'

Syntax Highlighting
Book report