Set X-Frame-Options in netlify config

[brentswisher]

This change: (check at least one)

• Adds a new feature
• Fixes a bug
• Improves maintainability
• Improves documentation
• Is a release activity

Is this a breaking change? (check one)

• Yes
• No

Is the: (complete all)

• Title of this pull request clear, concise, and indicative of the issue number it addresses, if any?
• Test suite(s) passing?
• Code coverage maximal?
• Changeset added?
• Component status page up to date?

What does this change address?
Sets the X-Frame-Options to allow storybook to load iframes

Additional context
Followup to #778

[changeset-bot]

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Latest commit: 0f886b3

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[github-actions]

size-limit report 📦

Path	Size
packages/pharos/lib/index.js	64.73 KB (0%)