Add suggestion to build packages from source when using renv

What is inaccurate?

Our current docs talk about using renv to install and manage packages. One key difference between it and the base install.packages command is that renv defaults to installing precompiled binaries instead of building directly from source like install.packages. This can cause hard to solve issues when installing some packages if they can't find the dependency headers they need. An example is trying to install the Matrix package. It will build correctly using install.packages in the latest R module since it's being built from source. However, the precompiled binary was built with base versions of LAPACK and BLAS, some linear algebra packages, that don't exist in the R module files on Cheaha. Instead, those modules automatically load OpenBLAS and ScaLAPACK which are used when building from source. Best suggestion is to build everything from source when installing packages using renv.

Where is the inaccuracy?

https://docs.rc.uab.edu/workflow_solutions/r_environments/#renv