add minijinja templating example #4355

Job	Run time
cargo-hack	3m 2s
check	1m 37s
cargo-public-api-crates (axum)	1m 50s
cargo-public-api-crates (axum-core)	17s
check-docs	1m 50s
cargo-public-api-crates (axum-extra)	28s
cargo-deny check (advisories)	25s
cargo-deny check (bans licenses sources)	23s
cargo-public-api-crates (axum-macros)	21s
Spell Check with Typos	4s
dependencies-are-sorted	18s
test-msrv	6m 7s
test-versions (stable)	2m 43s
test-docs	1m 53s
test-versions (beta)	2m 42s
armv5te-unknown-linux-musleabi	48s
test-nightly	2m 9s
wasm32-unknown-unknown	19s
	27m 16s

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