fix(docs): resolve Maven site template variables

[bednar]

Closes #438

Proposed Changes

• Migrate src/site/site.xml to Site Model 2.0.0.
• Update the Maven Fluido skin to 2.1.0, compatible with Maven Site Plugin 3.22.0.
• Preserve the project banner and site navigation with the current descriptor schema.

Checklist

• CHANGELOG.md updated
• Rebased/mergeable
• A test has been added if appropriate
• Tests pass
• Commit messages are conventional
• Sign CLA (if not already signed)

Validation Notes

• mvn -B -DskipTests site passed; generated top-level pages contain no unresolved template expressions.
• mvn -B -DskipTests verify passed, including checkstyle and license checks.
• Targeted tests passed: 296 tests, 0 failures, 28 skipped.
• The full test suite currently has 6 failures and 9 errors in existing FlightSQL/query tests on this JDK (RST_STREAM ... CANCEL / Arrow Unsafe).
• The PR is mergeable but currently behind main; GitHub CI is still running.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.73%. Comparing base (eae63b0) to head (f1b129a).
⚠️ Report is 7 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #439   +/-   ##
=======================================
  Coverage   88.73%   88.73%           
=======================================
  Files          21       21           
  Lines        1553     1553           
  Branches      281      281           
=======================================
  Hits         1378     1378           
  Misses         77       77           
  Partials       98       98           

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[Copilot]

🟢 Approval recommended

The changes are narrowly scoped to Maven Site configuration and appear consistent with the stated validation results and issue fix intent.

Pull request overview

Updates the project’s Maven Site descriptor to ensure template variables (e.g., ${project.name}) resolve correctly in the generated GitHub Pages documentation, addressing the issue reported in #438.

Changes:

• Migrated src/site/site.xml from Decoration Model 1.8.0 to Site Model 2.0.0.
• Upgraded the Maven Fluido skin version to 2.1.0 to align with Maven Site Plugin 3.22.0.
• Added a changelog entry documenting the documentation-site fix.

File summaries

File	Description
src/site/site.xml	Switches to Site Model 2.0.0 and updates the Fluido skin version to prevent unresolved template variables in generated site output.
CHANGELOG.md	Records the documentation-site fix under the upcoming release notes.

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 0
• Review effort level: Lite

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