Updates

• Add Assistive Technology: Getting started with VoiceOver on iOS
• Add Background: Introduction to the Web Accessibility Initiative
• Add How-to: Enabling keyboard culture with No Mouse Days
• Add How-to: Designing accessible animation
• Add How to: Use the tabindex attribute
• Add Assistiv Labs and Fable as sponsors
• Add plagiarism policy
• Add resources
• Add Boring Cyborg
• Fix table of contents
• Revert fonts
• Update authors order
• Update color contrast focus states
• Update dependencies

Thank you

@HarcourtHamsa @hidde Kelly Gillit @marcysutton @SaptakS