Parse tutorial links to improve UX

- Open external link in a new tab
- Force `shortcut` class on #code links
Footer improvements
change tutorial links aspect
Branding
Random improvements
Fix inspect layout and hover box
fix code icons
remove useless links in navigation
shorcut icon
hide inspect footers when no data
Fix actors list
Merge pull request #419 from typesafehub/wip/cleaning-large-refactoring-phase2

Cleaning UI