New structure (use _posts and not posts, so now posts are in root, rip
links)
New style for posts list in inde page, with date and tags
Make posts in index page generate from posts automatically
Make table of contents generate automatically
Use new posts layout for better maintainability
Introduce new `hosing` tag in config to specify where the page is
hosted, needed for 404 page
Some other stuff that I forgot about
