Reorganize: skill-centric layout — each skill shows its related commands

[VV1NN]

Problem

Users see a flat list of skills and commands mixed together, can't tell "this skill → what do I type to use it?"

Solution

Reorganize overview by skill as section header, with related commands listed underneath:

### bug-bounty [SKILL — auto-loaded]
Complete vulnerability hunting knowledge base.

Related commands:
  /scope target.com    — confirm target is in scope
  /hunt target.com     — actively hunt for vulnerabilities
  /validate            — verify finding is real

Suggested flow: /scope → /hunt → /validate → /report

• Each skill = one section
• Related commands listed below it with syntax
• Suggested workflow per skill (if applicable)
• Commands not tied to any skill → "General / Utilities"
• Works for any domain mix (security, finance, dev tools, etc.)