feat: add global navigation (resolves #308)

[greatislander]

• I've read the guidelines for Contributing to the Platform Co-op Toolkit
• This isn't a duplicate of an existing pull request

Description

Adds global navigation molecule.

Steps to test

Review Global Navigation component.

Additional information

Not applicable.

Related issues

• Resolves Global navigation bar #308.

[netlify]

Deploy preview for pinecone ready!

Built with commit 966946f

https://deploy-preview-309--pinecone.netlify.app

[cherylhjli]

It's looking a little funky for me!

[greatislander]

@cherylhjli fixed now

[jhung]

@cherylhjli What is the intended behaviour for the mobile breakpoint? Currently the global navigation does not stack properly and items are hidden:

[jhung]

@cherylhjli, I find the use of the pine tree logo twice confusing as they are visually similar and in roughly the same screen position (especially on mobile) - but do different things.

What do you think of the idea of putting the global navigation prominently above the footer?

[cherylhjli]

@jhung intended behaviour for mobile is that this global menu goes away, so I think what Ned has there is what is specced in the design. We tried a dropdown version, but it didn't quite work.

The resource library actually is supposed to have its own logo now to avoid the quadruple pine situation - it's in the v03 core screens file!

[greatislander]

I find the use of the pine tree logo twice confusing as they are visually similar and in roughly the same screen position (especially on mobile) - but do different things.

This is addressed here: #310

Fixed.