Ability to like (vote) on changelogs

[Autive]

This adds the ability to like/vote on changelogs as suggested in #205.

[Cannonb4ll]

So while this is great, it is double work. We already have a votes table that is polymorphic.

You can see that here: https://github.com/ploi/roadmap/blob/main/app/Traits/HasUpvote.php#L17

It's just a matter of applying the trait to your model (in this case Changelog.php) and using the available methods from that trait.

It saves another table creation, and everything else is already saved in that table automatically by calling the toggleUpvote() method. (https://github.com/ploi/roadmap/blob/main/app/Traits/HasUpvote.php#L31)

Item.php model has this: https://github.com/ploi/roadmap/blob/main/app/Models/Item.php#L25
Comment.php model has this: https://github.com/ploi/roadmap/blob/main/app/Models/Comment.php#L15

[Autive]

Didn't notice that, Changed the PR to move this to the Upvote Trait.

[Cannonb4ll]

🥰