Add dedicated documentation pages for each cloud browser provider: Browser Use, Browserbase, Browserless, and Kernel (sorted alphabetically). Uses providers/ path per maintainer feedback. - Fix Kernel defaults to match source code (KERNEL_HEADLESS=true, KERNEL_STEALTH=false) — README had these inverted - Add Providers section to sidebar navigation - Simplify cdp-mode cloud providers section to link to new pages Fixes part of #774 Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>