feat: add external nav links, new game, better contrast (#63)

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### Tests

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Reviewed-on: https://codeberg.org/nhcarrigan/portfolio/pulls/63
Co-authored-by: Naomi Carrigan <commits@nhcarrigan.com>
Co-committed-by: Naomi Carrigan <commits@nhcarrigan.com>

test/config/NavItems.spec.ts

@@ -20,11 +20,4 @@ describe("nav items", () => {
     expect(href, "links are not unique").toHaveLength(NavItems.length);
     expect(text, "names are not unique").toHaveLength(NavItems.length);
   });
-
-  it("should be internal links", () => {
-    expect.hasAssertions();
-    for (const nav of NavItems) {
-      expect(nav.href, `${nav.href} is not internal`).toMatch(/^\/[\da-z-]+$/);
-    }
-  });
 });