chore: fix broken link

[alexeagle]

Was reported on Bazel slack.

Also a couple drive-by readme improvements.

[aspect-workflows]

Test

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211 tests (100.0%) were fully cached saving 33s.

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e2e/bzlmod

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e2e/gyp_no_install_script

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e2e/js_image_oci

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e2e/npm_link_package

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e2e/npm_link_package-esm

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e2e/npm_translate_lock

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e2e/npm_translate_lock_empty

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e2e/npm_translate_lock_multi

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e2e/npm_translate_lock_partial_clone

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e2e/npm_translate_lock_replace_packages

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e2e/npm_translate_lock_subdir_patch

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e2e/npm_translate_package_lock

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e2e/npm_translate_yarn_lock

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e2e/package_json_module

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e2e/pnpm_lockfiles

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e2e/pnpm_workspace

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e2e/pnpm_workspace_rerooted

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e2e/repo_mapping

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e2e/rules_foo

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e2e/runfiles

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e2e/vendored_node

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1 test (100.0%) was fully cached saving 199ms.

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