Mod manager improvements

[pedrotski]

Describe the feature and why you would like to see it.

The current custom mod manager could use some work to make it nicer to use.

Describe the solution you'd like.

1. Add an update button that runs either an update bash or simply runs the installation bash again. - Add an update button to the mod manager frontend#428
2. Allow setting a URL with an external URL icon displayed to the user so they can tap it and get more information about the plugin they're installing.
3. Have a thumbnail field so we can add our own images if required. - Add custom images to user added mods frontend#387
4. Allow us to set our own docker image, as the current one included from wisp is pretty bare-bones, and it's missing critical things such as jq.
5. Set dependencies. For example, if a mod requires something, it will auto install it. I have a private version of this made if you want to reach out on Discord and ill show you how it all works.
6. Allow the ability to show/hide mods on the back end so when you're testing its not displayed to all the users. All mods should be showen to admins.

Optional additional context to this request.

n/a