fixup! Provide introduction/tutorial page for QUIC multi-stream #860

Job	Run time
check-ansi	5m 27s
check_update	2m 13s
address_ub_sanitizer	14m 15s
basic_clang	7m 34s
basic_gcc	8m 9s
check_docs	1m 10s
enable_non-default_options	8m 13s
fips_and_ktls	7m 49s
memory_sanitizer	19m 29s
minimal	3m 41s
no-deprecated	7m 1s
non-caching	21m 29s
no-shared (ubuntu-latest)	7m 10s
no-shared (macos-latest)	9m 0s
threads_sanitizer	7m 16s
buildtest	9m 35s
enable_brotli_and_asan_ubsan	16m 51s
enable_brotli_and_zstd_dynamic	9m 7s
enable_brotli_dynamic	9m 30s
enable_zstd_and_asan_ubsan	17m 23s
enable_zstd_dynamic	9m 17s
enable-tfo (ubuntu-latest)	9m 30s
enable-tfo (macos-latest)	10m 29s
external-tests	14m 37s
legacy	6m 45s
no-legacy	9m 5s
external-test-cf-quiche	7m 16s
external-test-pyca (1.51.0, 3.9)	12m 34s
out-of-source-and-install (ubuntu-latest)	9m 43s
out-of-source-and-install (macos-latest)	18m 39s
	5h 0m 17s

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