fix: Add social sharing metadata and simplified development section

[JaimeCernuda]

Summary

• Added enhanced OpenGraph and Twitter meta tags for proper IOWarp branding
• Created dedicated social sharing image using IOWarp logo
• Added simplified Development & Publishing section to README as requested
• Ensures IOWarp branding appears in social media and chat applications

Changes Made

• Social Metadata: Added OpenGraph and Twitter card meta tags with absolute URLs
• IOWarp Branding: Added IOWarp logo and social sharing image
• README: Added simplified Development & Publishing section with TestPyPI and release instructions
• Clean Implementation: No unwanted files, no submodule changes, no CLAUDE.md

Files Changed

• README.md - Added Development & Publishing section
• docs/docusaurus.config.js - Added social sharing metadata
• docs/static/img/iowarp_logo.png - IOWarp logo for branding
• docs/static/img/iowarp_social_card.png - Dedicated social sharing image

Development & Publishing Section Added

### Testing Development Versions
Development versions are automatically published to TestPyPI on every commit to main:
# Install latest dev version from TestPyPI
uvx --index-url https://test.pypi.org/simple/ iowarp-mcps

### Creating Releases
git tag v1.2.3
git push origin v1.2.3

Test Plan

• Clean commit from fresh dev branch
• No CLAUDE.md or iowarp_agents submodule
• Only requested changes included
• Targets dev branch correctly
• Social sharing metadata properly configured

This addresses the social sharing branding issue and adds the requested simplified development documentation.

[mattjala]

Looks good aside from the conflict.