Add zeal and fix bugs

These changes have been live for a few weeks now. The list of changes include
1. Fix site-list bug that would repeat nanosites
2. Add Zeal Optics as a custom application
3. Update dozuki.sh script to account for new Zeal Optics App
4. Update Dozuki App Icon graphics
5. Update Dozuki Logo graphics
6. Make clearer error message when no internet is present
7. Hide iFixit/Crucial from site list

These were most of the changes