issue-159 Add delete button to part profile (for part owner)

schema had to be update to add a deleted boolean to part.
Easier than setting up cascading deletes for comments and reactions.
resolves #159

api/prisma/schema.prisma

@@ -48,6 +48,7 @@ model Part {
   updatedAt   DateTime @updatedAt
   user        User     @relation(fields: [userId], references: [id])
   userId      String
+  deleted     Boolean  @default(false)
 
   Comment  Comment[]
   Reaction PartReaction[]