docs: update skills to use canonical `~/.config/opencode` location (#6132)

packages/web/src/content/docs/skills.mdx

@@ -14,7 +14,7 @@ Create one folder per skill name and put a `SKILL.md` inside it.
 OpenCode searches these locations:
 
 - Project config: `.opencode/skill/<name>/SKILL.md`
-- Global config: `~/.opencode/skill/<name>/SKILL.md`
+- Global config: `~/.config/opencode/skill/<name>/SKILL.md`
 - Claude-compatible: `.claude/skills/<name>/SKILL.md`
 
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@@ -24,7 +24,7 @@ OpenCode searches these locations:
 For project-local paths, OpenCode walks up from your current working directory until it reaches the git worktree.
 It loads any matching `skill/*/SKILL.md` in `.opencode/` and any matching `.claude/skills/*/SKILL.md` along the way.
 
-Global definitions are also loaded from `~/.opencode/skill/*/SKILL.md`.
+Global definitions are also loaded from `~/.config/opencode/skill/*/SKILL.md`.
 
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