Setup Alpha release channel for 2.0.0 releases

[atilafassina]

This PR sets up changeset so versions are bumped appropriately as we ship v2

[changeset-bot]

⚠️ No Changeset found

Latest commit: 53f635a

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.

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

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commit: 53f635a

[Copilot]

Pull request overview

This PR configures Changesets for alpha pre-release management as SolidStart transitions to version 2.0.0. It establishes the foundation for versioning both monorepo packages during the alpha phase.

Key Changes

• Created .changeset/pre.json to enable pre-release mode with the "alpha" tag
• Set initial versions for @solidjs/start at 2.0.0-alpha.0 and @solidjs/vite-plugin-nitro-2 at 0.1.0

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