Add accessibility recommendations from NeurIPS 2019 Disability in AI panel

[sanchalitorpe-source]

Description of Changes

This pull request adds a summary of the NeurIPS 2019 Disability in AI panel
and converts the discussion into actionable accessibility recommendations
for AI and ML conferences.

It highlights key considerations such as:

• Permanent physical accessibility (e.g., stage ramps)
• Quieter and less crowded poster sessions
• Well-being and scheduling considerations
• Invisible and chronic illnesses
• Cognitive disabilities and neurodiversity

The goal is to provide clear, practical guidelines to make conferences more inclusive.

Related Issue

Closes #45

Type of Change

• ✍️ New Content — Adds new chapters, examples, or significant sections

Additional Notes (Optional)

The content is based entirely on the panel transcript from NeurIPS 2019.
No personal or unrelated files are included.

Checklist

• I have searched open pull requests to avoid duplicates.
• I have built the book locally using the build instructions and verified my changes work as expected.
• I have written clear, conventional commit messages, as per the Pull Request Guidelines.

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[sanchalitorpe-source]

Hi! I’ve added the accessibility recommendations summary for NeurIPS 2019 panel (Issue #45).
Please review when convenient. Thanks!