Fix database page property types

Fixes #12

database.go

@@ -73,46 +73,10 @@ type People struct {
 	People []User `json:"people"`
 }
 
-type Files struct {
-	Files []File `json:"people"`
-}
-
 type File struct {
 	Name string `json:"name"`
 }
 
-type Checkbox struct {
-	Checkbox bool `json:"checked"`
-}
-
-type URL struct {
-	URL string `json:"url"`
-}
-
-type Email struct {
-	Email string `json:"email"`
-}
-
-type PhoneNumber struct {
-	PhoneNumber string `json:"phone_number"`
-}
-
-type CreatedTime struct {
-	CreatedTime time.Time `json:"created_time"`
-}
-
-type CreatedBy struct {
-	CreatedBy User `json:"created_by"`
-}
-
-type LastEditedTime struct {
-	LastEditedTime time.Time `json:"last_edited_time"`
-}
-
-type LastEditedBy struct {
-	LastEditedBy User `json:"last_edited_by"`
-}
-
 type DatabaseProperty struct {
 	ID   string               `json:"id"`
 	Type DatabasePropertyType `json:"type"`