feat(open_graph): different URLs for og:image and twitter:image

[KentarouTakeda]

What does it do?

Fixed to be able to set different URLs for og:image and twitter:image.

Motivation

There is no aspect ratio specification in og:image.

On the other hand, twitter:image has an aspect ratio regulation according to the value of twitter:card.

• summary_large_image

  Images for this Card support an aspect ratio of 2:1 with minimum dimensions of 300x157 or maximum of 4096x4096 pixels.

• summary

  Images for this Card support an aspect ratio of 1:1 with minimum dimensions of 144x144 or maximum of 4096x4096 pixels.

We want to optimize the image display when an article is shared on SNS. For example, og:image should be set to an image that can be cropped anywhere, and twitter:image should be set to an image optimized for the aspect ratio of the card.

How to test

git clone -b BRANCH https://github.com/USER/hexo.git
cd hexo
npm install
npm test

Screenshots

Pull request tasks

• Add test cases for the changes.
• Passed the CI test.

[coveralls]

Coverage increased (+0.002%) to 98.284% when pulling 2f1399a on KentarouTakeda:different-urls-for-ogimage-and-twitterimage into 042f862 on hexojs:master.

[KentarouTakeda]

@tomap @SukkaW
Thank you for review and merge!!