Restructures documentation and improves theme

[BraCR10]

1. Improves documentation structure by grouping related topics into sections for better navigation.
2. Enables folding in the sidebar to enhance navigation.

Closes #26

Note: Note: Please let me know if you have a different opinion about the section names, file placement, or whether this should be split into more sections.

Summary by CodeRabbit

• New Features

  • Enabled collapsible section folding in HTML output for improved navigation.
  • Added support for a custom CSS theme to apply visual tweaks.

• Style

  • Updated sidebar styling to improve visual hierarchy and readability of section titles.

• Documentation

  • Reorganized documentation into clear, categorized sections (Introduction, Orders, Trading, Disputes, Communication, Admin Operations, Session Management, Protocol Reference).

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[coderabbitai]

Walkthrough

Enabled HTML folding and referenced a custom CSS theme; reorganized documentation sidebar into structured top-level sections with nested items.

Changes

Cohort / File(s)	Summary
Configuration & Theme book.toml, theme/custom.css	Added additional-css = ["theme/custom.css"] and [output.html.fold] enable = true, level = 0 to book.toml. Added theme/custom.css with sidebar styling (white bold main section titles, light-gray bold expandable items, styling enforced with !important).
Documentation Structure src/SUMMARY.md	Reorganized flat list into named sections (Introduction, Orders, Trading, Disputes, Communication, Admin Operations, Session Management, Protocol Reference) and nested items; link targets unchanged.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Poem

🐰
I hopped through toml and tidy css art,
Folded the pages and gave them a start.
Sidebar titles now bold and bright,
Chapters grouped snug, all tidy and light.
A little rabbit cheers this doc-heart.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main changes: restructuring documentation (organizing content into sections) and improving the theme (CSS styling and folding features).
Linked Issues check	✅ Passed	All coding requirements from issue #26 are met: documentation organized into collapsible sections (SUMMARY.md restructure), folding enabled in HTML output (book.toml), and CSS styling added to improve sidebar readability (theme/custom.css).
Out of Scope Changes check	✅ Passed	All changes are directly aligned with the documentation improvement objective. The CSS styling, HTML folding configuration, and SUMMARY.md reorganization all contribute to reducing sidebar overwhelm and improving navigation as specified in issue #26.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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