Increase page click through and change tutorial links

Fixes https://github.com/super3/Peercoin.net/issues/107 and Fixes https://github.com/super3/Peercoin.net/issues/103

Also improved the mobile footer and placed the tutorial links section in the footer instead of separate in each page.
Merge pull request #117 from jvanoel/Links_fixes

Increase page click through and change tutorial links