Improve SEO metadata and rewrite README

[itsyogesh]

Summary

• Add sitemap.ts and robots.ts for search engine indexing
• Add JSON-LD structured data (SoftwareApplication schema with W3F funder)
• Add viewport export with theme-color for light/dark modes
• Add canonical URLs to all pages (home, studio, builder, docs)
• Fix homepage title from "Relaycode" (9 chars) to proper 50+ char title
• Trim description from 169 chars to 120 chars (within 110-160 optimal range)
• Add title.template so sub-pages render as "Page Title | Relaycode"
• Expand keywords to include Studio, Solidity, PolkaVM, Dedot, Polkadot Hub
• Rewrite README to reflect the full toolkit (Studio, Builder, Docs, Utilities)
• Add downloaded OG banner images to public/og/ for README display

Test plan

• Verify relaycode.org/sitemap.xml returns valid sitemap
• Verify relaycode.org/robots.txt returns valid robots config
• Check page titles via view-source on all pages
• Validate JSON-LD at https://search.google.com/test/rich-results
• Test OG previews at https://www.opengraph.xyz/url/https://relaycode.org

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Project	Deployment	Actions	Updated (UTC)
relaycode	Ready	Preview, Comment	Mar 22, 2026 3:08am

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 48.91%. Comparing base (1ea1e53) to head (27af2b5).
⚠️ Report is 1 commits behind head on master.
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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #41      +/-   ##
==========================================
+ Coverage   48.90%   48.91%   +0.01%     
==========================================
  Files         180      180              
  Lines       22946    22954       +8     
  Branches     1236     1237       +1     
==========================================
+ Hits        11221    11229       +8     
  Misses      11677    11677              
  Partials       48       48              

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