Cotes Chung 241bb4df78 feat: add site-wide social preview image settings (#1463) ...

- Add configuration field `social_preview_image` that sets the site-wide default social preview image.  

   For pages that do not have `page.image` set in font matter, the seo tag will use the image specified by `site.social_preview_image` as the Open Graph image.

- Refactored the generation of image URLs to reduce redundant code and enhance fault tolerance for missing or repeated slash `/` when defining image paths.

2024-01-10 09:04:27 +08:00

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