Control Style variables from config.toml

@ivangjxyz  I've played around with SCSS and was able to control the variables from the config.toml.

Simply set these as following:

[params]
body_max_width = "1920px"
content_ratio = 0.7

What do you think?

I still need to convert the rest of the CSS and split the variables and different sections in smaller pieces. But overall I really like the abilities of SCSS.