docs: Add comprehensive GitHub topics, hashtags, and social media strategy

- 20 GitHub topics for maximum discoverability
- Tiered hashtag strategy for social media reach
- Monthly Twitter/X campaign templates
- LinkedIn thought leadership strategy
- Reddit subreddit targeting and posting templates
- Stack Overflow engagement strategy
- Email newsletter templates and calendar
- 3-month content calendar
- Viral hooks and meme formats
- Google SEO optimization strategy
- Press and podcast outreach targets
- Success metrics and ROI tracking
- Implementation checklist

Author: AlphaAlgebra