Add a document on how to use Spack develop

[harshula]

Description

We currently have a document on how to use Spack develop for ACCESS-OM2 in the ACCESS-OM2 git repository:
https://github.com/ACCESS-NRI/ACCESS-OM2/blob/main/DEVELOPERS.md

We would like to make it available on Hive-Docs and generalise it to make it applicable to other models. e.g. ACCESS-ESM1.5.

Why

We want users to be able to use Spack to modify a model's source code, built it and run it.

Close Criteria

Spack develop document is available on Hive Docs.

[atteggiani]

Thanks for opening this issue @harshula!

I think the best approach for the addition of this content is the following:

1. Create a stand-alone page (something like "Build a model"), with the content you referred to above (initially I would take exactly the ACCESS-OM2 example as a reference).
   For example, another section called "Build a model" could be added to the "Run ACCESS-CM", "Run ACCESS-OM" and "Run ACCESS-ESM" sections. Something like this:

2. Differentiate the page for different models using tabs (see this example for different ACCESS-OM2 versions)
3. Link the respective model build page at the end of the "run <MODEL>" pages, in a paragraph that could be called "Custom <MODEL> build".

What do you think?

[atteggiani]

Decreased priority to Medium (will be done after the workshop) after release stand-up. @harshula