Request image alt text for next 12 days of HPC

[Sparrow0hawk]

At present we don't request users include alt text for 12 days of HPC images. This leads to us writing our own alt text which we can't guarantee is right.

Tasks:

• Add question to form for people to leave alt text

[Sparrow0hawk]

Good guide for alt text for figures - https://medium.com/nightingale/writing-alt-text-for-data-visualization-2a218ef43f81