docs: update Features & Categories section with comprehensive categorization

.gemini/antigravity/brain/2b094595-c6a8-459f-b382-555c5c55e88e/task.md

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+# Task: Create 7 New Skills from GitHub Repository Analysis
+
+## Phase 1 - High Impact
+
+- [ ] Create `prompt-library` skill
+- [ ] Create `javascript-mastery` skill
+- [ ] Create `llm-app-patterns` skill
+
+## Phase 2 - Medium Impact
+
+- [ ] Create `workflow-automation` skill
+- [ ] Create `autonomous-agent-patterns` skill
+
+## Phase 3 - Niche
+
+- [ ] Create `bun-development` skill
+- [ ] Create `github-workflow-automation` skill
+
+## Finalization
+
+- [ ] Update `skills_index.json` with all new skills
+- [ ] Update `README.md` with new skill entries
+- [ ] Run validation script