next-firebase-course

This PR seeks to update the firebase syntax from v8 to v10 and provide a reference of necessary changes for anyone building the project with @latest packages. Initially, I tired to only update the minimum dependencies of firebase, react and react-dom, but at the end I ran into one issue with throwing an error about not being passed a valid reference even though it was being passed and was seemingly working fine in other files. In the end, I decided to just update react/next.js to latest and this resolved the issue. The following changes are made: Update necessary packages to latest Fix bug with unheart showing because was being treated as a boolean instead of a function Similar PR Copies react-hook-form updates from https://github.com/fireship-io/next-firebase-course/pull/4 (If updating this course, please integrate the original authors PR first so they are credited) Temp fixes `legacyBehaviorlegacyBehavior` Updates all firebase commands and adds a few TODOs to consider Note* This is my first time using firebase so there might be a better implementation. I've placed a few TODOs with points you might need to consider if using this project as a boilerplate.

Fixed the incorrect variable usage in global.css