new post: haskell opengl matrices
post: opengl haskell matrices: clarify Data.Vec import
post: fix links
post: opengl: matrices: fix code typo
post: haskell matrices: fix 'lookAt' function

The new code is from my own private code following the
opengl-tutorial.org website. I realized that the old `lookAt` function
was broken when I tried to complete a tutorial on manipulating the
camera with the keyboard and mouse, as the camera was not behaving as in
the tutorial.
cabalize
haskell matrices: add blurb on fix
new post: quad monitor setup
new post: add haskell coding style
post: quad monitor: fix typo