[WIP] feat: remove legacy docs #6378

Job	Run time
Test on Node.js 18.x	39s
E2E on Node.js 18.x	1m 11s
Test on Node.js 20.x	37s
Build LlamaIndex Example (cloudflare-worker-agent)	40s
typecheck	1m 4s
Test on Node.js 22.x	45s
Build LlamaIndex Example (nextjs-agent)	1m 36s
Test on Node.js 23.x	49s
Build LlamaIndex Example (nextjs-edge-runtime)	1m 17s
E2E on Node.js 20.x	1m 21s
typecheck-examples	1m 34s
Build LlamaIndex Example (nextjs-node-runtime)	1m 17s
Build LlamaIndex Example (waku-query-engine)	1m 2s
E2E on Node.js 22.x	1m 13s
Build LlamaIndex Example (llama-parse-browser)	41s
E2E on Node.js 23.x	1m 23s
	17m 9s

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