fix(docs): update skills page to load from both skills/ and .claude/skills/ directories

[Copilot]

The Skills page linked to stale paths from before the skills consolidation in 89f7662. The data loader only scanned .claude/skills/, missing the two skills moved to skills/gpui and skills/gpui-component.

Description

• Updated docs/data/skills.data.js to scan both skills/ and .claude/skills/ directories instead of only .claude/skills/
• Used the full relative path (from repo root) as the skill id to prevent collisions if the same directory name appears in both locations

- const skillsDir = join(__dirname, "../../.claude/skills");
+ const skillsDirs = [
+   join(repoRoot, "skills"),
+   join(repoRoot, ".claude/skills"),
+ ];

Skills now resolved:

ID	Path
skills/gpui	skills/gpui/SKILL.md
skills/gpui-component	skills/gpui-component/SKILL.md
.claude/skills/gpui-component-dev	.claude/skills/gpui-component-dev/SKILL.md

Screenshot

Before	After
Links pointed to removed paths (e.g. .claude/skills/gpui-action/SKILL.md)	Links point to existing skill entry points

How to Test

Load the Skills page (/skills) and verify all skill cards link to existing GitHub paths.

Checklist

• I have read the CONTRIBUTING document and followed the guidelines.
• Reviewed the changes in this PR and confirmed AI generated code (If any) is accurate.
• Passed cargo run for story tests related to the changes.
• Tested macOS, Windows and Linux platforms performance (if the change is platform-specific)