docs: add --webpath instructions for aw-server-rust

[TimeToBuildBob]

Summary

• Add documentation for aw-server-rust --webpath flag as an alternative to copying web assets
• Fix typo ("replacing placing" → "replacing")

On some platforms (e.g. Windows), aw-server-rust bundles static assets into the executable, so copying files to the static/ directory has no effect. The --webpath flag provides a cleaner alternative.

Closes #608

---

Important

Add --webpath flag instructions for aw-server-rust and fix a typo in README.md.

• Documentation:
  • Add instructions for using --webpath flag with aw-server-rust in README.md.
  • Explain that --webpath is an alternative to copying web assets, useful for platforms bundling assets into the executable.
• Typo Fix:
  • Fix typo in README.md ("replacing placing" to "replacing").

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[ellipsis-dev]

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[greptile-apps]

Greptile Summary

This PR adds documentation for the --webpath flag in aw-server-rust and fixes a typo in the README.

Changes:

• Fixed typo: "replacing placing" → "replacing" on line 53
• Added new section documenting the --webpath flag as an alternative to copying web assets
• Explains that this is especially useful on Windows where static assets are bundled into the executable

The documentation is clear, accurate, and provides a helpful alternative workflow for developers working with aw-server-rust.

Confidence Score: 5/5

• This PR is safe to merge with no risk - it only adds documentation and fixes a typo
• Documentation-only change with clear improvements: fixes a grammatical error and adds helpful developer instructions. No code changes, no risk of introducing bugs or breaking changes
• No files require special attention

Important Files Changed

Filename	Overview
README.md	Fixed typo and added --webpath flag documentation for aw-server-rust

_{Last reviewed commit: a69591e}

[greptile-apps]

_{1 file reviewed, no comments}

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 26.20%. Comparing base (cd5aafe) to head (a69591e).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #764   +/-   ##
=======================================
  Coverage   26.20%   26.20%           
=======================================
  Files          29       29           
  Lines        1706     1706           
  Branches      311      298   -13     
=======================================
  Hits          447      447           
- Misses       1195     1237   +42     
+ Partials       64       22   -42     

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[TimeToBuildBob]

The failing CI check (Test (node-20, py-3.9, aw-server-rust master)) is a pre-existing upstream issue unrelated to this PR. The failure is in cleanup steps that try to glob ~/.cache/activitywatch/log/*/*.log — but aw-server-rust master doesn't write logs to that path, so the glob fails. All actual test steps pass (unit tests ✅, e2e testcafe ✅). Same pattern as PR #763.