Merge branch 'hpc_image' into 'main'

added the hpc image

See merge request !84

docs/first_steps/hpc_intro.md

@@ -16,3 +16,9 @@ Laptop             |  HPC
 :-------------------------:|:-------------------------:
 ![](../images/sparrow_tree3.jpg)  |  ![](../images/forest-fire.jpg)
 
+
+## Architecture of an HPC Cluster¶
+
+The basic architecture of a cluster consists of login nodes which allow access and submission of jobs to a scheduler, jobs are then dispatched to compute nodes for execution.
+
+![hpc](../images/HPC_architecture.png){ align=center }
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