Expand HOWTOs

[khaeru]

Discussed at the 2024-09-20 work session.

• Analogous to the one created in Add tools/info for TUEWAS Asia project (part 1) #21.
• With content need for “training the trainers” per the 2024-09-19 workshop.
• As needed for the Data Needs Assessment: Africa activity.

@jamesjhdixon @Verena205 will add a list of questions to be answered in comments below.

This is a tracking issue to cover multiple issues for individual HOWTOs, and ideate new ones, inter alia:

• Add a HOWTO for authoring SDMX-CSV directly #24