docs: overhaul README — clear intro + LSP7/LSP8 token sections

[emmet-bot]

Summary

Complete README overhaul for clarity and user-friendliness. The old README had a weak intro that didn't explain the value, and the Usage section buried the library's token deployment capabilities.

Key Changes

• Better intro: Opens with exactly what you can deploy (Universal Profiles, LSP7 tokens, LSP8 NFTs) in plain terms, plus a bullet with what each thing actually is ("smart accounts", "fungible tokens like ERC-20", etc.)
• Clearer setup: Condensed to a single tight block instead of scattered prose
• Token sections prominently added:
  • LSP7 Digital Asset (fungible token) with metadata example
  • LSP8 NFT with tokenIdFormat values explained
• Shorter overall: 119 lines removed, 95 added — net -24 lines, more content per line
• Node 22+ requirement mentioned up front
• Removed badge duplication

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.78%. Comparing base (039583e) to head (9cdf15d).
⚠️ Report is 37 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #279       +/-   ##
===========================================
+ Coverage   18.95%   98.78%   +79.82%     
===========================================
  Files          15        8        -7     
  Lines        1087      328      -759     
  Branches      390       42      -348     
===========================================
+ Hits          206      324      +118     
+ Misses        859        4      -855     
+ Partials       22        0       -22     

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