docs: add certforge-issuer to external issuers list

[CertForge100]

Adds certforge-issuer to the 🥈 tier external issuers list.

• Apache 2.0 license added to https://github.com/CertForge-LLC/certforge-issuer
• Links updated to https://certgov.app
• certforge added to .spelling
• Reference link sections formatted with correct blank line separators
• Single clean commit rebased directly onto current master

[cert-manager-prow]

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[wallrj]

Thanks — the project looks legitimate and the listing request is reasonable, but this is the third pull request for the same one-row change (#2118, #2233, and now this one). The earlier two are closed as superseded, not rejected. From here on, please push any updates to this branch rather than opening another PR; further duplicates will be closed without review.

To get this reviewed, fix the DCO check first: git commit --amend -s and force-push, per the instructions in the bot comment above.

with claude fable-5