take hlint's suggestions into account
rm unused
Give better structure to a post.

This has a side-effect of better css as well.
We now underline the `<a>` only when hover. We also now have a better tag and meta stuff at the end.
better structured frontpage
Display `#` symbol to denote a header link
update jquery
Include javascript to display hash on hover
Use em wherever useful
Fancier blockquote
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