docs(framework): Separate shared doc config into conf_base.py

[panh99]

Code moved from conf.py to the new conf_base.py without changes.

[Copilot]

Pull request overview

This PR factors shared Sphinx documentation configuration out of conf.py into a new conf_base.py to centralize common settings and keep the per-site config minimal.

Changes:

• Added framework/docs/source/conf_base.py containing the shared Sphinx configuration (extensions, HTML theme options, redirects, version/language context).
• Simplified framework/docs/source/conf.py to import shared config from conf_base.py and keep only framework-specific overrides (e.g., release, substitutions).

Reviewed changes

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

File	Description
framework/docs/source/conf_base.py	Introduces the shared Sphinx configuration previously embedded in conf.py.
framework/docs/source/conf.py	Replaces inlined shared Sphinx config with an import from conf_base.py.

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