edit styling to enable localization (#1276)

## Overview

- Add language to navigation to enable localization
- Update theme to accommodate localization
- Update README
- Cleanup unused CSS

## Type of change

**Type:** New styling and updated README

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Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Kathryn May <44557882+katmayb@users.noreply.github.com>

Author: 3 people