Library: changed colors, fonts, margins, added navbar logo, adjusted footer.

Changes in custom.css
=====================
-Added classes: .page-header, blockquote, .bs-docs-sidenav a, .bs-docs-sidenav a:hover

Changes in search.html
======================
-Added link to fonts.css stylesheet
-Added <style> for Roboto font in the <head>
-Added logo to navbar.
-Played with colors, fonts, and margins of sections.
-Adjusted the position of the footer to better fit page.

Other changes
=============
-Added the fonts folder to import the Roboto font. Delete or replace this with whatever font you want (or not).
-Created new file: fonts.css