Rename `rinja` into `askama` #1094

Job	Run time
Book	6s
Docs (askama)	26s
Docs (askama_derive)	23s
Audit	18s
Check order in Cargo.toml	4s
Docs (askama_parser)	12s
DevSkim	29s
Jinja2-Assumptions	8s
Typos	23s
Rustfmt	14s
Test (ubuntu-latest, stable)	1m 22s
MSRV	23s
Package (bench-build)	27s
Test (ubuntu-latest, beta)	1m 2s
Test (macos-latest, stable)	1m 18s
Package (examples/actix-web-app)	43s
Package (examples/axum-app)	31s
Test (windows-latest, stable)	2m 36s
Package (examples/poem-app)	42s
Package (examples/rocket-app)	42s
Package (examples/salvo-app)	42s
Package (examples/warp-app)	41s
Package (fuzzing)	32s
Package (askama)	30s
Package (askama_derive)	29s
Package (askama_derive_standalone)	27s
Package (askama_parser)	30s
Package (testing)	37s
Package (testing-alloc)	23s
Package (testing-no-std)	26s
Package (testing-renamed)	1s
Cluster-Fuzz	0s
Fuzz	0s
	17m 47s

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