docs: Remove manual tables of content #4767

Job	Run time
cargo-hack	3m 0s
cargo-public-api-crates (axum)	30s
check	41s
cargo-public-api-crates (axum-core)	22s
check-docs	24s
cargo-public-api-crates (axum-extra)	29s
cargo-deny check (advisories)	24s
cargo-public-api-crates (axum-macros)	17s
cargo-deny check (bans licenses sources)	23s
dependencies-are-sorted	18s
Spell Check with Typos	0s
test-msrv	2m 23s
test-nightly	1m 16s
test-docs	1m 35s
armv5te-unknown-linux-musleabi	19s
test-versions (stable)	1m 19s
wasm32-unknown-unknown	13s
test-versions (beta)	1m 20s
	15m 13s

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