ci: Add ReadtheDocs configuration file

[junliang-tan]

What does this Pull Request accomplish?

Adds a Read the Docs configuration that:

• Builds the Sphinx documentation on Ubuntu 24.04 with Python 3.11.
• Installs the project’s main and documentation dependency groups in the Read the Docs virtual environment.
• Uses docs/conf.py as the Sphinx configuration file.

Why should this Pull Request be merged?

This configuration enables the project documentation to be built and hosted by Read the Docs.

What testing has been done?

The configuration will be validated by the Read the Docs build triggered for this pull request.

[ni-github-admins]

✅ Snyk checks have passed. No issues have been found so far.

Status	Scan Engine	Critical	High	Medium	Low	Total (0)
✅	Code Security	0	0	0	0	0 issues

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[github-actions]

Test Results

   14 files  ±0     14 suites  ±0   14m 23s ⏱️ +46s
  224 tests ±0    224 ✅ ±0  0 💤 ±0  0 ❌ ±0 
3 136 runs  ±0  3 136 ✅ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit 9f3bbeb. ± Comparison against base commit 9e2f01a.

[Copilot]

Pull request overview

Adds a Read the Docs configuration so the project’s Sphinx documentation can be built/hosted via RTD using the repository’s Poetry dependency groups.

Changes:

• Introduces .readthedocs.yml targeting Ubuntu 24.04 with Python 3.11.
• Installs Poetry and installs the main + docs dependency groups during the RTD build.
• Points RTD’s Sphinx build at docs/conf.py.

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