chore: add porto deprecation notices

[tmm]

Adds Porto sunsetting notices to porto.sh, the SDK docs, and the GitHub README linking to the Ithaca announcement.

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Project	Deployment	Actions	Updated (UTC)
dialog.porto	Ready	Preview, Comment	Jun 19, 2026 7:10pm
docs.porto	Ready	Preview, Comment	Jun 19, 2026 7:10pm
id.porto	Ready	Preview, Comment	Jun 19, 2026 7:10pm
playground.porto	Ready	Preview, Comment	Jun 19, 2026 7:10pm
wagmi.porto	Ready	Preview, Comment	Jun 19, 2026 7:10pm

3 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
interop.porto	Ignored	Preview	Jun 19, 2026 7:10pm
porto-ui	Ignored	Preview	Jun 19, 2026 7:10pm
proxy.porto	Ignored	Preview	Jun 19, 2026 7:10pm

[changeset-bot]

⚠️ No Changeset found

Latest commit: 501bbe2

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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commit: 501bbe2

[github-actions]

size-limit report 📦

Path	Size	Loading time (3g)	Running time (snapdragon)	Total time
import { Porto } from 'porto'	63.67 KB (+0.12% 🔺)	1.3 s (+0.12% 🔺)	104 ms (+12.86% 🔺)	1.4 s
import { porto } from 'porto/wagmi/Connector'	17.92 KB (0%)	359 ms (0%)	120 ms (+59.43% 🔺)	478 ms

[github-actions]

Built extension for 501bbe2013dcbdf095f32ebf5182a3f6af9c206e.

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