feat: Customize Portals navigation group

[BcnCarlos]

Summary

• Adds a new Customize Portals navigation group above Custom Domains in the Customize section
• Creates stub pages portals/overview.mdx and portals/configure.mdx for content population

Test plan

• Verify "Customize Portals" group appears above "Custom Domains" in the sidebar
• Confirm both stub pages render without errors in mint dev

🤖 Generated with Claude Code

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Project	Status	Preview	Updated (UTC)
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[github-actions]

Summary

Status	Count
🔍 Total	1
✅ Successful	0
⏳ Timeouts	0
🔀 Redirected	0
👻 Excluded	1
❓ Unknown	0
🚫 Errors	0
⛔ Unsupported	0
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