fix: move SKILL.md into skills/ subdirectory to align with agentskills spec

[tomaspozo]

Summary

• Move SKILL.md from repo root to skills/supabase-server/SKILL.md to align with the agentskills spec
• npx skills add was copying the entire repo contents instead of just the skill file, because the skill discovery sets path to the directory containing SKILL.md — which was the repo root
• Update package.json files to include skills directory

[Copilot]

Pull request overview

Moves the agent skill definition out of the repository root into a dedicated skills/ subdirectory to align with the agentskills discovery spec and prevent tooling from treating the entire repo as the skill payload.

Changes:

• Relocated the Supabase server skill file to skills/supabase-server/SKILL.md.
• Updated the skill trigger description to include supabase/server mentions.
• Updated package.json publish whitelist to include the skills directory.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
skills/supabase-server/SKILL.md	Updates skill metadata/trigger text after moving the skill under skills/.
package.json	Adjusts npm files whitelist to publish the skill content from skills/.

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[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated no new comments.

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