Streamline sample site css

After running the generator for 2.0.0rc1 I noticed a few inconsistencies with the CSS. I've added styles for the H1 for the home page to make it fall in-line with the headers on the other pages. I also generalized the CSS for code spans and blocks in the event that they are used outside of post page. I ran into this when I added ```post.excerpt``` to the list of posts.