docs: expand README with key features, bundle guide, and code examples - #1058

Changed pages include:

• index.html - view
• 360.html - view
• _template.html - view
• adaptive-streaming.html - view
• all.html - view
• analytics.html - view
• api.html - view
• aspect-ratio-crop.html - view
• audio.html - view
• autoplay-on-scroll.html - view

There are more changes not included in the list