Add header bar to example pages

website/docs/examples/ev.md

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 title: "Example: Electric Vehicle"
+hide_title: true
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-# S2 examples for electric vehicles
+![image not found](/img/example-ev-header.png)
 
 This page serves as a guide for implementing a S2 RM for an electric vehicle (charge point), or to give a CEM developer a better understanding of what to expect when controlling the energy flexibility of electric vehicles. It provides some example S2 messages for a (fictional) EV as well.
 

website/docs/examples/heat-pump.md

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 title: "Example: Heat Pump"
+hide_title: true
 ---
 
-# S2 examples for heat pumps
+![image not found](/img/example-heat-pumps-header.png)
 
 This page serves as a guide for implementing an S2 RM for a heat pump, or to give a CEM developer a better understanding of what to expect when controlling the energy flexibility of a heat pump. It provides some example S2 messages for same (fictional) heat pumps.
 

website/docs/examples/pv.md

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 title: "Example: PV Installation"
+hide_title: true
 ---
 
-# S2 example for PV installations
+![image not found](/img/example-pv-header.png)
 
 This page serves as a guide for implementing an S2 RM for a PV installation. It provides example S2 messages that help developers to understand how to interact with PV installations and what kind of flexibility they can offer.