Description

The docs site was 404ing on /docs/savings, so this adds a short alias page that points users at the existing community savings content.

Closes #1759

Type of Change

• Documentation update

Changes Made

• Added docs/content/docs/savings.mdx as an alias route.
• Added savings to the docs nav metadata.

Testing

• Unit tests pass (pytest)
• Linting passes (ruff check .)
• Type checking passes (mypy headroom)
• New tests added for new functionality
• Manual testing performed

Test Output

Docs-only verification:
- Reviewed route and nav diff for the new alias page.
- Confirmed alias targets existing `community-savings` and metrics docs instead of a dead route.

Real Behavior Proof

• Environment: GitHub PR diff review for docs-only route alias.
• Exact command / steps: Compared new savings page and nav entry against existing community savings docs and metrics references.
• Observed result: /docs/savings now has a dedicated alias page instead of pointing users at a 404.
• Not tested: Live deployed docs site after publish in this verification pass.

Review Readiness

• I have performed a self-review
• This PR is ready for human review

Checklist

• My code follows the project's style guidelines
• I have performed a self-review of my 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
• New and existing unit tests pass locally with my changes
• I have updated the CHANGELOG.md if applicable