chore: move theme setting in user level from workspace level

apiserver/plane/db/models/user.py

@@ -72,6 +72,7 @@ class User(AbstractBaseUser, PermissionsMixin):
     my_issues_prop = models.JSONField(null=True)
     role = models.CharField(max_length=300, null=True, blank=True)
     is_bot = models.BooleanField(default=False)
+    theme = models.JSONField(default=dict)
 
     USERNAME_FIELD = "email"
 

apiserver/plane/db/models/workspace.py

@@ -48,9 +48,6 @@ class WorkspaceMember(BaseModel):
     role = models.PositiveSmallIntegerField(choices=ROLE_CHOICES, default=10)
     company_role = models.TextField(null=True, blank=True)
     view_props = models.JSONField(null=True, blank=True)
-    workspace_theme = models.ForeignKey(
-        "db.WorkspaceTheme", on_delete=models.SET_NULL, related_name="theme", null=True
-    )
 
     class Meta:
         unique_together = ["workspace", "member"]