docs: Add chart install and v1->v2 upgrade instructions

[wnevis-cmyk]

• Adds documentation for upgrades
• Includes cert-manager installation requirement

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📥 Commits

Reviewing files that changed from the base of the PR and between 6f8f6a4 and 623b289.

📒 Files selected for processing (2)

• README.md
• deploy/operator/README.md

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[wnevis-cmyk]

Pending #295 where I'll merge this into the migration doc there