docs: add formula demo

[kagol]

PR

效果：

PR Checklist

Please check if your PR fulfills the following requirements:

• [x] The commit message follows our Commit Message Guidelines
• [ ] Tests for the changes have been added (for bug fixes / features)
• [x] Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• [ ] Bugfix
• [ ] Feature
• [ ] Code style update (formatting, local variables)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Build related changes
• [ ] CI related changes
• [x] Documentation content changes
• [ ] Other... Please describe:

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

• [ ] Yes
• [x] No

Other information

Summary by CodeRabbit

• New Features

  • Added a sidebar entry for direct access to formula documentation.
  • Introduced a rich text editor component for formula editing using KaTeX.
  • Added documentation on inserting mathematical formulas into documents.

• Dependencies

  • Integrated the KaTeX library for rendering mathematical expressions.

[coderabbitai[bot]]

[!CAUTION]

Review failed

The pull request is closed.

Walkthrough

The changes introduce a new sidebar entry for formula documentation, a Vue component for rich text editing with formula support using KaTeX, and related documentation. Additionally, a new dependency for KaTeX is added to enhance mathematical rendering capabilities in the project.

Changes

Files	Change Summary
packages/docs/fluent-editor/.vitepress/sidebar.ts, packages/docs/fluent-editor/docs/formula.md	Added a sidebar entry for formula documentation and created new documentation for formula insertion.
packages/docs/fluent-editor/demos/formula.vue	Introduced a Vue component for rich text editing with formula support using the FluentEditor and KaTeX.
packages/docs/package.json	Added katex dependency to support mathematical expression rendering.

Sequence Diagram(s)

sequenceDiagram
    participant User
    participant Editor
    participant KaTeX

    User->>Editor: Open editor
    Editor->>User: Display toolbar
    User->>Editor: Click "Insert Formula"
    Editor->>KaTeX: Render formula
    KaTeX-->>Editor: Return rendered formula
    Editor-->>User: Display rendered formula

🐰 In the meadow, I hop with glee,
New formulas dance, oh so free!
With KaTeX magic, equations shine,
In the editor's glow, all is fine.
A sidebar blooms, knowledge to share,
Hooray for changes, beyond compare! 🌼

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