#387 draft use of make-based approach

[pearsonca]

Description

This PR demonstrates the idea discussed in #387. Briefly, the idea is intro make rules for building some of the package content (e.g. vignettes), with the idea of simplifying local and automated builds of these package elements.

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[pearsonca]

Some open items maybe to do:

• updating actions to take advantage of the infrastructure addition
• dissecting the vignette builds a bit more to focus the rebuilding a bit (e.g. separate out the computation a bit)

[seabbs]

Yes I think this makes sense though ideally would be able to selective build certain vignettes. Can we override the checkpointing to force an update (this might be needed when R code changes but the vignettes themselves remain the same)