Update site theme

[IanMadd]

Description

Update site theme.

This cleans up the page layouts so they're simpler.

Definition of Done

Issues Resolved

[List any existing issues this PR resolves, or any Discourse or StackOverflow discussion that's relevant]

Related PRs

Check List

• [ ] Spell Check
• [ ] Local build
• [ ] Examine the local build
• [ ] All tests pass

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[sonarqubecloud[bot]]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
5 Security Hotspots
No data about Coverage
10.0% Duplication on New Code

See analysis details on SonarCloud