New scss files and changes

Created layout and type sccss files. Deleted “base.scss” files.
Imported them to the styles.scss file.

Type file:
Added $white, $red, and $headerfont
Added h1, header h1, section h1, h2, header h2, nav, a, a:visited,
a:hover, and article rules.

Layout file:
Added $white, $dark, and $light.
Added body, ing, section h1, nav, and article rules.