Feat/quartz rebrand

[braddf]

Pull Request

Description

Update logos and brand references to new Quartz name and graphics.

Fixes #362

How Has This Been Tested?

Manually on a Vercel Preview deploy

Checklist:

• [x] My code follows OCF's coding style guidelines
• [x] I have performed a self-review of my own code
• [x] I have made corresponding changes to the documentation
• [ ] I have added tests that prove my fix is effective or that my feature works
• [x] I have checked my code and corrected any misspellings

[vercel[bot]]

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Name	Status	Preview	Comments	Updated (UTC)
nowcasting-app	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 10, 2023 2:36pm
nowcasting-website	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 10, 2023 2:36pm