Notice (banner) on install

[bop34]

Describe the feature request

Make a modal appear when Discord for the first time after Replugged is installed.

Why should this be added?

This make it much clearer to the user that Replugged has successfully been installed.

Additional information

No response

Please confirm the following

• [X] This is a feature request for Replugged itself, not a feature request for a plugin or theme
• [X] I searched the issues to make sure this feature has not been requested before.

[asportnoy]

Should be a notice (banner), not a modal.

[mrhappyma]

I'd like to give this a shot

[asportnoy]

Assigned