Fix SWC configuration docs link

[ai-hustle-bro]

Summary

• Update the README's Storybook SWC configuration docs link to the current main-config/main-config-swc URL.
• Add a patch changeset for the README fix, per this repo's release instructions.

Closes #28.

Validation

• corepack pnpm@10.12.4 install --frozen-lockfile
• corepack pnpm@10.12.4 check:ci
• corepack pnpm@10.12.4 build
• git diff --check
• Confirmed the old URL returns 404 and the new URL returns 200 with PowerShell Invoke-WebRequest -Method Head.
• Claude Code CLI reviewed the docs-only diff as PASS.