docs: document chain-path and fullchain-path inputs/outputs (PR #7)

[krakenhavoc]

Documentation gaps addressed

Scanned PR #7 (week of 2026-04-27): feat: add chain and fullchain certificate file support.

New docs added

Inputs table — Added two new inputs introduced in PR #7:

• chain-path (default ./chain.pem) — path to save intermediate CA chain
• fullchain-path (default ./fullchain.pem) — path to save leaf + intermediates

Outputs table — Added corresponding outputs:

• chain-path — absolute path to saved intermediate chain PEM
• fullchain-path — absolute path to saved full chain PEM

Commands section — Updated issue, renew, and download descriptions to note that all three certificate file types are produced.

New "Certificate Chain Files" section — Explains the difference between cert-path, chain-path, and fullchain-path and when to use each (most web servers expect fullchain-path).

New usage example — "Deploy with full chain (nginx, HAProxy)" showing fullchain-path output usage.

Stale content fixed

• Updated cert-path description from "certificate PEM" to "leaf certificate PEM" for clarity.

Suggested version bump

PR #7 is an additive feature (new inputs/outputs, no breaking changes). Suggest bumping from the current release to a minor version — e.g., v1.1.0 — once PR #7 merges.

Related PRs

• feat: add chain and fullchain certificate file support #7 — chain and fullchain support (open, pending merge)
• feat: add full certificate chain download and display support cli#7 — CLI chain flags (dependency)
• feat: add full certificate chain support app#79 — backend chain endpoint (dependency)

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