Rename `rinja` into `askama` #1103

Job	Run time
Docs (askama)	21s
Docs (askama_derive)	21s
Docs (askama_parser)	18s
DevSkim	29s
Check order in Cargo.toml	7s
Book	6s
Jinja2-Assumptions	7s
Rustfmt	13s
Typos	25s
Audit	24s
Test (ubuntu-latest, stable)	50s
Test (ubuntu-latest, beta)	1m 3s
MSRV	22s
Test (macos-latest, stable)	1m 14s
Package (bench-build)	20s
Test (windows-latest, stable)	1m 54s
Package (examples/actix-web-app)	55s
Package (examples/axum-app)	36s
Package (examples/poem-app)	55s
Package (examples/rocket-app)	1m 16s
Package (examples/salvo-app)	1m 7s
Package (examples/warp-app)	58s
Package (fuzzing)	33s
Package (askama)	34s
Package (askama_derive)	23s
Package (askama_derive_standalone)	42s
Package (askama_parser)	38s
Package (testing)	1m 2s
Package (testing-alloc)	18s
Package (testing-no-std)	29s
Package (testing-renamed)	28s
Fuzz (all)	5m 14s
Fuzz (filters)	5m 20s
Fuzz (html)	5m 16s
Fuzz (parser)	5m 15s
	40m 33s

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