docs: add comparison page and improve landing page #106

Job	Run time
Format	13s
Build (macos-latest, aarch64-apple-darwin, agentkernel-darwin-arm64)	50s
Build (macos-13, x86_64-apple-darwin, agentkernel-darwin-x64)	1s
Security Audit	2m 53s
Test (ubuntu-latest)	38s
Clippy	31s
Docker Integration Tests	39s
Build (ubuntu-latest, x86_64-unknown-linux-gnu, agentkernel-linux-x64)	50s
Check	30s
Test (macos-latest)	51s
	7m 56s

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