Add doctoc prek hook for long MD files

[shahar1]

replaces: #1307

[Copilot]

Pull request overview

This PR adds a doctoc pre-commit hook to automatically generate and maintain table of contents for long Markdown files in the repository. The hook is configured to run on sphinx_airflow_theme/README.md and CONTRIBUTE.md, limiting TOC depth to level 2 headers.

Key changes:

• Adds doctoc pre-commit hook configuration with frozen version v2.2.0
• Generates TOC sections at the beginning of two documentation files
• Configures maxlevel argument to limit TOC depth to 2 levels

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
.pre-commit-config.yaml	Adds doctoc hook configuration targeting two specific markdown files with maxlevel=2 argument
sphinx_airflow_theme/README.md	Adds auto-generated table of contents section at the file beginning
CONTRIBUTE.md	Adds auto-generated table of contents section at the file beginning

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