Add missing CSS loaders for todomvc app (#3535) #1311

Job	Run time
Check	1m 36s
build_benchmarks	1m 14s
build_nightly	2m 29s
build_examples	4m 37s
Verify that web-sys is compiled correctly	1m 41s
Clippy	6m 39s
dist_linux_aarch64_gnu	4m 56s
dist_linux_x86_64_musl	3m 52s
dist_macos_aarch64	3m 16s
dist_macos_x86_64	4m 6s
dist_windows	5m 16s
doc_api	1m 42s
doc_book	32s
Rustfmt	25s
Build and test the deno example	1m 12s
Run js-sys crate tests	3m 46s
Run native tests	2m 41s
Run wasm-bindgen crate tests with multithreading enabled	4m 36s
Test TypeScript output of wasm-bindgen	1m 30s
Run UI compile-fail tests	2m 22s
Run wasm-bindgen crate tests (unix)	8m 34s
Run web-sys crate tests	5m 20s
Run wasm-bindgen-webidl crate tests	4m 35s
test_examples	3m 12s
deploy	2m 23s
	1h 22m 32s

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