Added terms route

Added a terms of service Rails route
Terms of Service added + responsive header

The Terms of Service have been added, similar to the dark theme of the other external
 pages (about/faq). Also gone ahead and made the header responsive.
Added Terms to footer

'Terms' link has been added to the footer.
Merge pull request #168 from spetri/terms_of_service

[74611342] Terms of service