remove external dependencies

[sergiomaffeis]

two files dynamically import fonts:

• sml-website/assets/css/main.css

  Line 2 in 05bd6f4

  @import url("https://fonts.googleapis.com/css?family=Open+Sans:400,600,400italic,600italic|Roboto+Slab:400,700");

• sml-website/assets/sass/main.scss

  Line 8 in 05bd6f4

  @import url('https://fonts.googleapis.com/css?family=Open+Sans:400,600,400italic,600italic|Roboto+Slab:400,700');

remove and make self-contained