update colors of links

I like the light-blue because it pops but I decided that should just be
a mouse-over color. I still think something is missing to make the links
to make them stand out more. I'm not very good at this.
update the styles for the main page

I was tired of seeing the main page all cramped together. Since the HTML
of this page is still all just filler, the structure may change in the
future. Right now all of the articles have a similar layout and when I
add a system for posting a reading entries I'll be able to make it
dynamic.