docs: add chain-path / fullchain-path inputs and outputs (weekly audit)

[krakenhavoc]

Weekly Documentation Audit — 2026-05-12

Documentation Gaps Addressed

PR #7 (open) adds chain-path and fullchain-path inputs/outputs to the action, but README.md was not updated. This PR closes that gap.

Gap	Fix
chain-path input missing from Inputs table	Added with description and default value
fullchain-path input missing from Inputs table	Added with description and default value
chain-path output missing from Outputs table	Added — path to chain.pem (intermediate CA chain)
fullchain-path output missing from Outputs table	Added — path to fullchain.pem (leaf + intermediates)
cert-path description said "certificate" generically	Clarified to "leaf certificate PEM"
No explanation of the three output file types	Added Certificate Chain Files section
No usage example for nginx/HAProxy that needs a full chain	Added Deploy with full chain example

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Files Changed

• README.md — inputs table, outputs table, new section, new example

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Suggested Version Bump

Once PR #7 merges, tag v1.1.0 — the new inputs and outputs are additive (backwards-compatible) but constitute a minor feature addition per semver.

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