fix: header logo/nav/svg

[johneatmon]

Changes

Overall, improve Astro's site header:

• Remove duplicate h1 tag (an h1 tag was in header and main).
• Remove article tags from header.
• Improved accessibility for the SVG logo, per guidelines from this CSS Tricks article.
• Restructure navigation links into an unordered list with list role, guidelines from 5t3ph's HTML Recipes.
• Add Logo structured data because...why not?

Testing

Ran astro build — no build errors 😁

Docs

None changed

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Latest commit: d152556

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[justinnoel]

Nice looking first Astro PR! Way to go @johnnytest4real !

I love how you referenced tools and guidelines!

[natemoo-re]

This is a wonderful PR! Approved once CI passes. 🎉

Thank you for outlining the reasoning behind these changes, that is super helpful context.