Docs: 4 videos in Readme for 4 layers

[ngaurav]

1. Live browser: We can show benchmarks of how the AXI is better than vanilla chrome-devtools-mcp or agent-browser
2. Sitemap Notes: We can show how pre-compiled notes help us avoid gotchas. (We should create a mini benchmark as this mirrors real world scenario closer than anything else. Could be an extension of Benchmark used in layer 1)
3. CLI authoring: We need to show 2 things: how easy it is to create a CLI. And once cli is created what capabilities get unlocked.
4. CLI extension: We need to show something like libretto