Move skill to `skills/` directory for `gh skill` compatibility

[devantler]

Summary

The bubbletea skill at .claude/skills/bubbletea/SKILL.md cannot be discovered or updated by gh skill because it lives under a hidden directory (.claude/).

Problem

When running gh skill update, the tool reports:

! Skipping bubbletea: no skills found in ggprompts/tfe
  Expected skills in skills/*/SKILL.md, skills/{scope}/*/SKILL.md,
  */SKILL.md, or plugins/*/skills/*/SKILL.md
  This repository may be a curated list rather than a skills publisher

gh skill searches these patterns in the source repo:

• skills/*/SKILL.md
• skills/{scope}/*/SKILL.md
• */SKILL.md
• plugins/*/skills/*/SKILL.md

The current path .claude/skills/bubbletea/SKILL.md does not match any of these patterns because .claude is a hidden (dot-prefixed) directory.

Proposed Solution

Move the skill from:

.claude/skills/bubbletea/SKILL.md

to:

skills/bubbletea/SKILL.md

This matches the skills/*/SKILL.md pattern and allows gh skill to discover and manage the skill.