Add blog opengraph image generation

[GlitchWitch]

Problem

Currently our open graph images (those displayed when sharing to social media) just use the blog feature image but lack any kind of additional details.

Solution

• We should implement a solution like Githubs to dynamically generate these images
  • We should use the post.image.feature as the background
  • We should include the title
  • We should include the subtitle
  • We should include the author
  • We should include the date

Additional Information

This example may be a perfect guide for us https://ognjen.io/automatic-jekyll-post-previews/