Change of styling

Added tag title to logo
Fixed navigation position and layout
Changed top Download Wallet button
Fixed header (title/buttons)
Fixed Why Peercoin styling
Improved Services Boxes styling
Improved YouTube video styling
Improved FAQ styling
Improved Tutorials styling
Improved Footer Styling
Fixed tablet and mobile navigation
Fixed navigation dropdown
Removed inline styling in html files
Added Table of Contents in main.css
Added peercoin.js file
Improved some HTML tags
Merge pull request #88 from jvanoel/Style_Change

Change of styling