[74611342] Terms of service

Terms of Service page completed (navigate to beta.forekast.com/termsofservice). Also, made the fade-in header responsive (by basically getting rid of it on smaller screen sizes).

Additionally, should we add a link to the Terms of Service in the footer?
We should be using proper url helpers:
https://github.com/Forekasting/kiwi/commit/b67f3014a4b74e23ecf093a4bc3843b7f943bd60#diff-9599427925097c3c66f26ac1e0de5cadR49