docs(storage-plugin): update to explain standalone API

[arturovt]

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[nx-cloud]

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✅ Successfully ran 6 targets

• nx run-many --target=test --all --configuration=ci --base=remotes/origin/master --head=HEAD
• nx run-many --target=lint --all --configuration=ci --base=remotes/origin/master --head=HEAD
• nx lint-types store
• nx run-many --target=build --all
• nx run-many --target=lint --all
• nx run-many --target=test --all --configuration=ci --maxWorkers=4

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[bundlemon]

BundleMon (Integration Projects)

Unchanged files (2)

Status	Path	Size	Limits
✅	Main bundles(Gzip) hello-world-ng17/dist-integration/main.(hash) .js	68.43KB	+1%
✅	Main bundles(Gzip) hello-world-ng16/dist-integration/main.(hash) .js	66.93KB	+1%

No change in files bundle size

Final result: ✅

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