fix(typography): properly pass Google font options

[saberzero1]

Fixes typography configuration not properly handling FontSpecification.

// Examples:

// string only
typography: {
  header: "Schibsted Grotesk",
  ...
}

// FontSpecification with name, weights and italics
typography: {
  header: {
    name: "Schibsted Grotesk",
    weights: [400, 700],
    includeItalic: true,
  },
  ...
}

Pull Request Overview

This PR fixes the typography configuration to properly handle both string and FontSpecification values for Google font options.

• Adds documentation for specifying fonts as either a string or a FontSpecification in docs/configuration.md
• Updates the theme utility to correctly extract the font name from either type in quartz/util/theme.ts

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
docs/configuration.md	Adds a new section for specifying fonts with examples
quartz/util/theme.ts	Updates font interpolations to use getFontSpecificationName for extracting font names

[saberzero1]

Good bot.