Misc docs rendering fixes

[ksivaman]

Description

Please include a brief summary of the changes, relevant motivation and context.

Fixes # (issue)

Type of change

• Documentation change (change only to the documentation, either a fix or a new content)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Infra/Build change
• Code refactoring

Changes

Please list the changes introduced in this PR:

• Change A
• Change B

Checklist:

• I have read and followed the contributing guidelines
• The functionality is complete
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[greptile-apps]

Greptile Summary

The PR improves documentation rendering across light and dark themes.

• Adds responsive and dark-mode styling for SVG diagrams, output blocks, and Sphinx tabs.
• Replaces inline presentation styles with reusable CSS classes and updates diagram markup.
• Configures the documentation workflow to use the locally bundled version-switcher data.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
.github/workflows/docs.yml	Configures documentation builds to reference the version-switcher JSON copied into the generated HTML.
docs/_static/css/diagram-colors.css	Adds shared diagram classes and extensive dark-theme overrides for inline documentation SVGs.
docs/_static/css/output-style.css	Restyles code-output sections and adds corresponding dark-mode presentation.
docs/_static/css/sphinx_tabs.css	Adds dark-theme colors for Sphinx tab controls and panels.
docs/_static/css/svg-responsive.css	Broadens responsive SVG handling and adds a dark-mode fallback for image-embedded SVGs.
docs/getting_started/index.rst	Updates documentation markup to use the reusable rendering styles introduced by this PR.

_{Reviews (2): Last reviewed commit: "Dark mode fixes for docs diagrams, tabs ..." | Re-trigger Greptile}

[pggPL]

@ksivaman I fixed style issues and I think it looks OK