[Landing] Update headings and descriptions for clarity in README, ins… #6744

Job	Run time
compute-version	3s
build-docs / build-docs	1m 30s
build-artifacts / code-lint	46s
build-artifacts / frontend-build	13s
build-artifacts / gateway-build	14s
build-artifacts / runner-test (macos-latest)	1m 9s
build-artifacts / runner-test (ubuntu-latest)	1m 6s
build-artifacts / python-build	25s
build-artifacts / generate-json-schema	17s
build-artifacts / python-test (macos-latest, 3.9)	3m 22s
build-artifacts / python-test (ubuntu-latest, 3.12)	10m 29s
build-artifacts / python-test (macos-latest, 3.13)	3m 49s
build-artifacts / python-test (macos-latest, 3.12)	2m 55s
build-artifacts / python-test (windows-latest, 3.10)	2m 8s
build-artifacts / python-test (ubuntu-latest, 3.11)	9m 39s
build-artifacts / python-test (ubuntu-latest, 3.10)	10m 15s
build-artifacts / python-test (macos-latest, 3.10)	7m 58s
build-artifacts / python-test (macos-latest, 3.11)	7m 26s
build-artifacts / python-test (windows-latest, 3.13)	2m 46s
build-artifacts / python-test (windows-latest, 3.12)	2m 32s
build-artifacts / python-test (windows-latest, 3.9)	2m 59s
build-artifacts / python-test (ubuntu-latest, 3.9)	10m 46s
build-artifacts / python-test (ubuntu-latest, 3.13)	8m 16s
build-artifacts / python-test (windows-latest, 3.11)	2m 13s
build-artifacts / runner-compile (ubuntu-24.04-arm, linux, arm64)	31s
build-artifacts / runner-compile (ubuntu-24.04, linux, amd64)	26s
upload-post-pypi-artifacts / upload-post-pypi-artifacts	14s
upload-pre-pypi-artifacts / upload-pre-pypi-artifacts	24s
	1h 34m 51s

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