Refactor docs to use ExDocs search_data model for global HexDocs indexing of Gleam packages #8381

Job	Run time
test-wasm	1m 33s
test (stable, x86_64-unknown-linux-gnu)	3m 47s
rustfmt	12s
test (stable, x86_64-unknown-linux-musl)	4m 19s
validate	19s
test (stable, aarch64-unknown-linux-gnu)	2m 11s
lint-build	55s
test (stable, aarch64-unknown-linux-musl)	2m 48s
test (stable, x86_64-apple-darwin)	6m 38s
test (stable, x86_64-pc-windows-msvc)	5m 48s
test (stable, aarch64-apple-darwin, macos-latest, arm64, cargo, true)	3m 28s
test-projects	1m 47s
	33m 45s

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