feat: add initial layout and components

[chosww]

• Add base layout and styles for home and about pages (projects page is there, but it will have different layout)
• Implement a header component with UIO Integration
• Implement collapsable navigation bar depends on screen size
• Populate mock data to display, later they will be replaced by appropriate collection data

[cloudflare-workers-and-pages]

Deploying inclusive-standards with    Cloudflare Pages

Latest commit:	8888a65
Status:	🚫  Build failed.

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[greatislander]

Hi @chosww — a number of changes here. Once you've gone through them all, let's meet to discuss.