* Social Cards Part 2
This is a follow up to part 1: https://github.com/thepracticaldev/dev.to/pull/2090.
This PR updates the og:image URLs to use the new social_preview.png urls
added in Part 1.
So that the already generated/cached images do not need to be recreated,
this sets a MIGRATION_DATETIME. Any object that has been updated after
that date will generate a new image
Objects from before that date will not. They will use the new url.
* Fix weird change made by rubocop autocorrect
* Handle organizations + users
* Run CI
* Use time with zone to be explicit about timezone
* Simplify branching in user_social_image_url method
* Fix param alignment + bump migration date
