Move to Pharmaverse

We will be moving this repo from insightengineering to pharmaverse organization.

Possible affected files include:
- README
- DESCRIPTION
- _pkgdown.yml

Start by reviewing README, DESCRIPTION, and _pkgdown.yml for references to the insightengineering organization and note how the repository metadata and documentation identify the project. Update the affected organization references for pharmaverse, then verify the three named files no longer point to the old organization.

Written by the indexing model from the issue text.