Fix image previews for works and edition pages on Facebook and twitter

tabshaikh commented 4 years ago

Followup for #3212

Most of the previews were showing up but sometimes without an image
If an image does not show up in a preview this may be due the image size not being sufficient.
Facebook demands The URL of the image for your object. It should be at least 600×315 pixels, but 1200×630 or larger is preferred (up to 5MB). Stay close to a 1.91:1 aspect ratio to avoid cropping.
Twitter demands A URL to a unique image representing the content of the page. You should not use a generic image such as your website logo, author photo, or other image that spans multiple pages. Images for this Card support an aspect ratio of 1:1 with minimum dimensions of 144x144 or maximum of 4096x4096 pixels. Images must be less than 5MB in size. The image will be cropped to a square on all platforms. JPG, PNG, WEBP and GIF formats are supported. Only the first frame of an animated GIF will be used. SVG is not supported.
Previews for home page is fixed -> Pr #3462
For image previews we would need to increase the resolution of covers which will automatically fix things
Works page with a lot of editions previews fails to load with a timeout error