chore: sync skills with marketplace.json and README

.claude-plugin/marketplace.json

@@ -13,7 +13,49 @@
     {
       "name": "marketing-skills",
       "description": "40 marketing skills for technical marketers and founders: ASO, CRO, copywriting, cold email, SEO, AI SEO, paid ads, ad creative, video production, image generation, churn prevention, pricing strategy, referral programs, revenue operations, sales enablement, customer research, site architecture, and more",
-      "source": "./"
+      "source": "./",
+      "skills": [
+        "./skills/ab-test-setup",
+        "./skills/ad-creative",
+        "./skills/ai-seo",
+        "./skills/analytics-tracking",
+        "./skills/aso-audit",
+        "./skills/churn-prevention",
+        "./skills/cold-email",
+        "./skills/community-marketing",
+        "./skills/competitor-alternatives",
+        "./skills/competitor-profiling",
+        "./skills/content-strategy",
+        "./skills/copy-editing",
+        "./skills/copywriting",
+        "./skills/customer-research",
+        "./skills/directory-submissions",
+        "./skills/email-sequence",
+        "./skills/form-cro",
+        "./skills/free-tool-strategy",
+        "./skills/image",
+        "./skills/launch-strategy",
+        "./skills/lead-magnets",
+        "./skills/marketing-ideas",
+        "./skills/marketing-psychology",
+        "./skills/onboarding-cro",
+        "./skills/page-cro",
+        "./skills/paid-ads",
+        "./skills/paywall-upgrade-cro",
+        "./skills/popup-cro",
+        "./skills/pricing-strategy",
+        "./skills/product-marketing-context",
+        "./skills/programmatic-seo",
+        "./skills/referral-program",
+        "./skills/revops",
+        "./skills/sales-enablement",
+        "./skills/schema-markup",
+        "./skills/seo-audit",
+        "./skills/signup-flow-cro",
+        "./skills/site-architecture",
+        "./skills/social-content",
+        "./skills/video"
+      ]
     }
   ]
 }