docs: update directories for aw-server-rust and add Edit on GitHub links

[TimeToBuildBob]

Summary

• Update directories.rst with correct aw-server-rust paths — since v0.12 the default server is aw-server-rust, but the docs still referenced old Python server paths
• Fill in cache directory paths for Windows and macOS (previously TODO)
• Note the per-component subdirectory convention (each component gets its own subdirectory)
• Update appdirs-rs crate reference to dirs (which aw-server-rust actually uses)
• Add html_context to conf.py for "Edit on GitHub" links in the RTD theme

Fixes #155, fixes #158.

Test plan

• Verify ReadTheDocs build passes
• Check directories page renders correctly
• Check "Edit on GitHub" link appears on pages

---

Important

Update documentation for aw-server-rust paths and add "Edit on GitHub" links.

• Documentation Updates:
  • Update directories.rst to reflect aw-server-rust paths for data, config, logs, and cache directories on Windows, macOS, and Linux.
  • Note subdirectory convention for each component in directories.rst.
  • Update reference from appdirs-rs to dirs crate in directories.rst.
• Configuration:
  • Add html_context in conf.py for "Edit on GitHub" links in the RTD theme.

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[ellipsis-dev]

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[ErikBjare]

@TimeToBuildBob See the review comments here