Pull Request Title

Add 'SecondBrain URL' field to tribe settings modal https://github.com/stakwork/sphinx-mac/issues/312

This pull request addresses the Add 'SecondBrain URL' field to tribe settings modal in Issue https://github.com/stakwork/sphinx-mac/issues/312.

Add a new field to Tribe Settings called SecondBrain URL
- New field in Tribes schema called second_brain_url
- Add new input field to paste in a URL

Groups.storyboard
- Added custom view that contain label and textfield to the Groups.storyboard and constraint it
Groups Manager class
- Added the property secondBrainUrl to the struct TribeInfo inside Groups Manager class
- Updated the setInfo method in the Groups Manager class by adding to the input parameters optional secondBrainUrl and also updating its content in the appropriate property
- Updated the getNewGroupParams method by adding to the dictionary the content of the secondBrainUrl Field
- Updated the update method by getting the value of the second_brain_url from the json object and setting it into tribeInfo.secondBrainUrl
CreateTribeViewModel
- Updated the CreateTribeViewModel with a new property called secondBrainUrl
- Update the setInfo in the CreateTribeViewModel
CreateTribeViewController
- Added an IBOutlet of secondBrainUrlField: NSTextField! to the CreateTribeViewController
- Updated the completeEditView method by updating the content of the secondBrainUrlField with the secondBrainUrl from the chatTribeInfo method