- add example section
- seo: add OG image and meta tags
- update favicon
- add usage section
- add footer and social links
- add pin-input form component
- add code copy functionality
- implement main layout
- implement theme switch
- a11y: add sr-only text in copy button
- optimize onComplete/onIncomplete invocation
- update github links
- update snippet accordion
- update png background image with webp format