Add markitup-mcp-server to Marketing section

Five tools for AI image annotation and marketing-visual generation:
generate, regen, extend (AI outpaint), background removal, balance.
Calls the MarkItUp API (Claude analysis + Gemini render).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

README.md

@@ -1814,6 +1814,7 @@ Tools for creating and editing marketing content, working with web meta data, pr
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+- [smythmyke/markitup-mcp-server](https://github.com/smythmyke/markitup-mcp-server) 📇 ☁️ - AI image annotation and marketing-visual generator powered by [MarkItUp](https://markitup.app). Five tools: generate polished marketing visuals from a screenshot (Claude writes copy → Gemini renders across 50+ templates including glassmorphic, bold marketing, documentation, and app store), regen, AI outpaint, and HD background removal. Install: `npx -y markitup-mcp-server`.
 
 ### 📊 <a name="monitoring"></a>Monitoring