Refactor docs to use ExDocs search_data model for global HexDocs indexing of Gleam packages #8356

Job	Run time
test-wasm	1m 35s
test (stable, x86_64-unknown-linux-gnu)	3m 36s
lint-build	52s
test (stable, x86_64-unknown-linux-musl)	5m 34s
rustfmt	13s
validate	17s
test (stable, aarch64-unknown-linux-gnu)	2m 19s
test (stable, aarch64-unknown-linux-musl)	2m 44s
test (stable, x86_64-apple-darwin)	13m 13s
test (stable, x86_64-pc-windows-msvc)	5m 1s
test (stable, aarch64-apple-darwin, macos-latest, arm64, cargo, true)	3m 56s
test-projects	1m 51s
	41m 11s

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