Create vignette on generating renv lockfile from log file

[parmsam-pfizer]

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[parmsam-pfizer]

Fixes #161 in the form of a vignette. Needs to incorporate the exact package versions declared in the log file.

[bms63]

@parmsam-pfizer any ideas on the failing actions? I think it says lines 20-24 which are just library calls.

@kodesiba @nicholas-masel want to do a mini-release before winter holidays?? get this vignette ready and knock out a few low hanging issues?