Adding optional custom logo to header with darkmode support

[si1k]

Description

Added the ability to add a logo to the top header. This feature is optional. It also supports using just one logo/image or having different ones for both light and dark mode.

On non-root pages the logo will link to the home page and on the root page the logo is shown without a link. I added padding to ensure the logo does not shift when switching between pages and root.

Note: It does require navigationStyle: 'custom' - last commit added this to the site.config.ts comments.

Notion Test Page ID

I have it implemented on my page - https://alexchaveriat.com/

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