Required updates for p2panda-js 0.6.0 and GraphQL API

[sandreae]

• update GraphQL API
• bump p2panda-js to 0.6.0
• bonus: don't use documentId when previous is enough

closes: #3 #2

📋 Checklist

• Add tests that cover your changes
• Add this PR to the Unreleased section in CHANGELOG.md
• Link this PR to any issues it closes
• New files contain a SPDX license header

[codecov]

Codecov Report

Base: 96.62% // Head: 96.63% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (bed8ea7) compared to base (7fecdf4).
Patch coverage: 96.29% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #4      +/-   ##
==========================================
+ Coverage   96.62%   96.63%   +0.01%     
==========================================
  Files          11       11              
  Lines         237      238       +1     
  Branches       40       40              
==========================================
+ Hits          229      230       +1     
  Misses          8        8              

Impacted Files	Coverage Δ
src/session/session.ts	92.85% <92.30%> (ø)
src/document/document.ts	100.00% <100.00%> (ø)
src/entry/entry.ts	100.00% <100.00%> (ø)
test/fixtures.ts	100.00% <100.00%> (ø)

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