Add Bio to user table, set varchar for role in attendance table

Signed-off-by: Asai Neko <sugar@sne.moe>

data/user.go

@@ -21,6 +21,7 @@ type User struct {
 	Nickname        string    `json:"nickname"`
 	Subtitle        string    `json:"subtitle"`
 	Avatar          string    `json:"avatar"`
+	Bio             string    `json:"bio" gorm:"type:text"`
 	PermissionLevel uint      `json:"permission_level" gorm:"default:10;not null"`
 }