R: Vignettes and other documentation

# Vignettes and other documentation

## Vignettes from package 'eigencore'

eigencore::benchmarks |  | Benchmark smoke tests | HTML | source | R code
eigencore::certificates |  | Certificates: reading the numerical evidence | HTML | source | R code
eigencore::eigencore |  | Get started with eigencore | HTML | source | R code
eigencore::generalized-eigenproblems |  | Generalized eigenvalue problems with eigencore | HTML | source | R code