docs: Update links to demos

docs: Fix header spacing

docs: Add demo & repo links to header

docs: Update screenshot in code notes

chore: Post screenshot images

docs: Add 5.6 App Store Preparation

docs: Add 5.5 Handling Photos

docs: Add 5.4 Notifications

docs: Add 5.3 Animations

docs: Add 5.2 Geolocation

docs: Add 5.1 Add Live Tab

docs: Add 4.10 Drawer Navigator

docs: Add 4.9 Add Stack/Entry Detail

docs: Add 4.8 Stack Navigator

docs: Add 4.6 StatusBar & 4.7 Summary