Starting with a clean plate
Restoring the favicon
First part of a first draft of a new layout

It is greatly inspired by the current layout, but features two columns.
Aside from everything that isn't finished yet, I should take care of
* better implementation of the columns, compatible with smaller screens
* check behaviour without JS
* check behaviour in browsers different from Google Chome 22 and
  Iceweasel 3.5
Moving the navigation around

No more visual clutter on top
Relative paths and removed href's from links
Added MathJax to the draft
Added information on GitHub to the code view

The text behind the 'updates' link would explain that the website is
not a realtime version of the Git project, and could discuss the "Added
new tags" commit messages as indicators of when things have been
updated. If this is a good idea, of course, but I think a tighter
integration would be beneficial.
Added a 'meta' section to the sidebar

Not sure whether this is essential, but the displaying trick I tried is
useful in a later stage. There could be more interesting meta
information too.
Added comments from tag 02RB

The default style seems okay, but of course this is not really
browser-independent, so some tweaking might be required.

And for some reason I try to use single quotes in HTML, double quotes in
JS. Maybe I have OCD.
Fixed title behaviour for show / hide comments
The label of the tag is interesting meta info

It is displayed in the current version of the website, so for now I'll
do the same in the new layout.
Complete area of link in menu clickable

And I slightly changed the spacing to something I find more agreeable.
Copied comments section

Minor displaying updates, started using a <noscript> tag concerning the
preview (I should only write the explanation of the preview option when
JS is enabled). A preliminary form validation in JS would be nice too.
Moved CSS to separate folder, and split files
Forgot to add css/main.css
Fixed bug in code / rendered toggle

By moving the thing to an inline function I didn't add the event
parameter.
The header for comment input looks like link

And reordered the code
Moved the JS submodules to a js/ folder

I'm not sure whether everything is correct...
Adding the js/ folder
Adding the rest of the tag for testing purposes