Update mkdocstrings config to render Pydantic field metadata

[nanxstats]

Fixes #188

This PR updates the mkdocstrings configuration to properly render Pydantic field metadata on the Zensical site, mostly ported from the pydantic mkdocs.yml.

• Enable the griffe-pydantic extension in Zensical mkdocstrings configuration.
• Set force_inspection = false to render Pydantic models correctly.
• Declare RTFDocument._table_space as a private attribute to avoid render errors in static mode.
• Update monospace font to use system font stack.
• Update extra.css to style new elements introduced by the extension.

The key visible changes include:

• Rich field/validator sections for Pydantic models.
• Expandable "Show JSON schema" element for the classes.
• The symbol type (class, attribute, method, func) shown before each symbol name.

[Copilot]

Pull request overview

This PR enhances the documentation rendering for Pydantic models by integrating the griffe-pydantic extension into the mkdocstrings configuration. The changes enable richer API documentation with field metadata, validators, and JSON schemas.

Key changes:

• Integrate griffe-pydantic extension with mkdocstrings configuration for enhanced Pydantic model rendering
• Fix a private attribute declaration in RTFDocument to prevent static mode render errors
• Update CSS styling to accommodate new documentation elements and switch to system font stack

Reviewed changes

Copilot reviewed 8 out of 11 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
zensical.toml	Configure mkdocstrings with griffe-pydantic extension and related rendering options
src/rtflite/encode.py	Import PrivateAttr and declare _table_space as a Pydantic private attribute
src/rtflite/input.py	Add backticks around parameter and class names in docstrings for better formatting
pyproject.toml	Add griffe-pydantic dependency to dev requirements
docs/stylesheets/extra.css	Remove JetBrains Mono font declarations, switch to system font stack, and add styles for new documentation elements
docs/changelog.md	Document the mkdocstrings configuration updates
CHANGELOG.md	Document the mkdocstrings configuration updates
.github/workflows/docs.yml	Add griffe-pydantic to CI dependency installation

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