use new, improved r-universe URL schema (#104)

https://ropensci.org/blog/2023/01/30/runiverse-permanent-urls/

README.md

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 [![R-CMD-check](https://github.com/RMI-PACTA/pacta.portfolio.import/actions/workflows/R-CMD-check.yaml/badge.svg)](https://github.com/RMI-PACTA/pacta.portfolio.import/actions/workflows/R-CMD-check.yaml)
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 The `pacta.portfolio.import` R package provides a number of functions to facilitate the importing of a portfolio CSV intended to be used by the [`pacta.portfolio.audit`](https://github.com/RMI-PACTA/pacta.portfolio.audit) and [`pacta.portfolio.allocate`](https://github.com/RMI-PACTA/pacta.portfolio.allocate) R packages. Its primary exported function is `read_portfolio_csv()` which can read in one or more portfolio CSVs. Its other utility functions allow `read_portfolio_csv()` to work around a variety of formatting and encoding issues that have been seen in the wild, such as: automatically determining strange file encodings, strange number formats and numerical marks, and adapting to non-standard delimiters.