[P] Remove use-case diagram

diagrams/use-case.puml

@@ -1,23 +0,0 @@
-@startuml
-rectangle IoT-Systems {
-  usecase "Collect telemetry (accelerometer + GPS)" as uc1
-  usecase "Send telemetry" as uc2
-  usecase "Process telemetry" as uc3
-  usecase "Determine road condition (pothole / bump /\nnormal)" as uc4
-  usecase "View road defect marks" as uc5
-  usecase "View route on map" as uc6
-}
-
-rectangle "The user is the card operator" as uc10
-rectangle "Sensor Agent\n(Device/STM32/Emulator)" as uc11
-
-uc11 - uc1
-uc11 - uc2
-
-uc10 - uc5
-uc10 - uc6
-
-uc2 -.|> uc3 : <<include>>
-uc3 -.|> uc4 : <<include>>
-
-@enduml