Rename `rinja` into `askama` #1095

Job	Run time
Book	3s
Audit	16s
DevSkim	29s
Check order in Cargo.toml	4s
Docs (askama)	22s
Jinja2-Assumptions	7s
Docs (askama_derive)	19s
Rustfmt	16s
Docs (askama_parser)	13s
Typos	22s
MSRV	21s
Package (bench-build)	22s
Test (ubuntu-latest, stable)	46s
Package (examples/actix-web-app)	1m 4s
Test (ubuntu-latest, beta)	46s
Package (examples/axum-app)	46s
Test (macos-latest, stable)	53s
Package (examples/poem-app)	49s
Test (windows-latest, stable)	1m 54s
Package (examples/rocket-app)	1m 29s
Package (examples/salvo-app)	1m 10s
Package (examples/warp-app)	1m 5s
Package (fuzzing)	37s
Package (askama)	37s
Package (askama_derive)	29s
Package (askama_derive_standalone)	43s
Package (askama_parser)	38s
Package (testing)	1m 5s
Package (testing-alloc)	22s
Package (testing-no-std)	22s
Package (testing-renamed)	21s
Fuzz (all)	5m 16s
Cluster-Fuzz	1m 15s
Fuzz (filters)	5m 30s
Fuzz (html)	5m 14s
Fuzz (parser)	5m 19s
	41m 44s

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