Simplify todos_index in todos example #5053

Job	Run time
cargo-hack	6m 11s
check-docs	39s
check	1m 46s
cargo-public-api-crates (axum)	30s
cargo-deny check (advisories)	30s
cargo-public-api-crates (axum-core)	19s
dependencies-are-sorted	12s
Spell Check with Typos	5s
cargo-deny check (bans licenses sources)	27s
cargo-public-api-crates (axum-extra)	33s
cargo-public-api-crates (axum-macros)	28s
armv5te-unknown-linux-musleabi	54s
test-docs	1m 58s
test-nightly	1m 36s
test-msrv	2m 28s
test-versions (stable)	3m 42s
wasm32-unknown-unknown	14s
test-versions (beta)	2m 38s
	25m 10s

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