Remove pandoc dependency

[Mayank447]

Description
Pandoc was used for rendering the tutorials page in our documentation to convert html -> rst since sphinx only support html as an output format not input. Replacing the html jinja template with equivalent rst removes the need for Pandoc.

Related issues or PRs
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[Copilot]

Pull request overview

This PR removes the Pandoc dependency from the documentation build by switching the tutorials index generation from an HTML→RST conversion workflow to directly generating native RST from a Jinja template.

Changes:

• Added a native tutorials.rst.jinja template and removed the old tutorials.html.jinja template.
• Updated the tutorials index generator script to render RST directly (eliminating the Pandoc conversion step).
• Removed Pandoc references from contributor docs and from the Read the Docs apt package installation.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
doc/source/tutorials-website/tutorials.rst.jinja	New RST-native Jinja template for the tutorials index page.
doc/source/tutorials-website/tutorials.html.jinja	Removed the old HTML template (no longer needed without Pandoc).
doc/source/tutorials-website/create_tutorials_html.py	Switched generation from HTML + Pandoc conversion to direct RST rendering.
doc/source/contribution-docs.rst	Removed documentation text stating Pandoc is required.
.readthedocs.yaml	Removed Pandoc apt installation from the RTD build environment.

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