docs: deprecation banner

[leabarth]

Description

Adds a banner to the docs that informs the user about the deprecation of Liquid Oxygen and redirects to Liquid Carbon.

Type of change

• Feature
• Bugfix
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

Is it a breaking change?

• Yes
• No

How Has This Been Tested?

• unit tests
• e2e tests
• accessibility tests
• tested manually
• other:

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• 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 (if applicable)
• New and existing tests pass locally with my changes

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Project	Deployment	Preview	Comments	Updated (UTC)
liquid	Ready	Preview	Comment	Nov 28, 2025 1:00pm