Add concrete example tied to research use

[aturner-epcc]

Address issue raised in peer review:

Motivation: It can be beneficial to create a concrete example to develop the exercises for the persona you are developing the lesson for.
For example, you need a Docker container to reproduce a plot from an old article or to use a Docker container to run X scientific software that has a different OS than the one the researcher has installed on the computer. It is difficult to think of good examples but it can be more meaningful and motivating to place the student in a concrete situation. Only a plot or text appearing on the computer with a random phrase after running a container can make the lesson more attractive.

[aturner-epcc]

Could use the BLAST+ example from the Singularity lesson for this:

https://github.com/EPCCed/2023-09-21_Singularity_Nottingham/blob/gh-pages/_episodes/singularity-blast.md