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Expanded PModules docs

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pages/merlin6/01-Quick-Start-Guide/introduction.md
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## The Merlin local HPC cluster
Historically, the local HPC clusters at PSI were named Merlin. Over the years,
Historically, the local HPC clusters at PSI were named **Merlin**. Over the years,
multiple generations of Merlin have been deployed.
At present, the **Merlin local HPC cluster** contains _two_ generations of it: the old **Merlin5** cluster and the newest **Merlin6**.
### Merlin6
Merlin6 is a the official PSI Local HPC cluster for development and
@ -26,16 +28,27 @@ Merlin6 is designed to be extensible, so is technically possible to add
more compute nodes and cluster storage without significant increase of
the costs of the manpower and the operations.
Merlin6 is mostly based on **CPU** resources, but also contains a small amount
of **GPU**-based resources which are mostly used by the BIO Division and Deep Learning projects:
* The Merlin6 CPU nodes are in a dedicated Slurm cluster called [**`merlin6`**](/merlin6/slurm-configuration.html).
* This is the default Slurm cluster configured in the login nodes, and any job submitted without the option `--cluster` will be submited to this cluster.
* The Merlin6 GPU resources are in a dedicated Slurm cluster called [**`gmerlin6`**](/gmerlin6/slurm-configuration.html).
Merlin6 contains all the main services needed for running cluster, including
**login nodes**, **storage**, **computing nodes** and other *subservices*,
connected to the central PSI IT infrastructure.
#### CPU and GPU Slurm clusters
The Merlin6 **computing nodes** are mostly based on **CPU** resources. However,
it also contains a small amount of **GPU**-based resources, which are mostly used
by the BIO Division and by Deep Leaning project.
These computational resources are split into **two** different **[Slurm](https://slurm.schedmd.com/overview.html)** clusters:
* The Merlin6 CPU nodes are in a dedicated **[Slurm](https://slurm.schedmd.com/overview.html)** cluster called [**`merlin6`**](/merlin6/slurm-configuration.html).
* This is the **default Slurm cluster** configured in the login nodes: any job submitted without the option `--cluster` will be submited to this cluster.
* The Merlin6 GPU resources are in a dedicated **[Slurm](https://slurm.schedmd.com/overview.html)** cluster called [**`gmerlin6`**](/gmerlin6/slurm-configuration.html).
* Users submitting to the **`gmerlin6`** GPU cluster need to specify the option ``--cluster=gmerlin6``.
### Merlin5
The old Slurm **CPU** *merlin* cluster is still active and is maintained in a best effort basis.
**Merlin5** only contains **computing nodes** resources in a dedicated **[Slurm](https://slurm.schedmd.com/overview.html)** cluster.
* The Merlin5 CPU cluster is called [**merlin5**](/merlin5/slurm-configuration.html).
## Merlin Architecture