promote guides to main menu

[SallyMcGrath]

and mount it where we want it

I've moved the guides to the main menu by adding it the syllabus menu
I've updated the link in the secondary menu from Guides to direct back to main curriculum
Except for on main curriculum where it goes to the main CYF site

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Lighthouse	1 paths audited Performance: 100 (no change from production) Accessibility: 100 (no change from production) Best Practices: 92 (no change from production) SEO: 91 (🟢 up 9 from production) PWA: - View the detailed breakdown and full score reports

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