R: Vignettes and other documentation

# Vignettes and other documentation

## Vignettes from package 'orbitr'

orbitr::building-two-body-orbits |  | Building Two-Body Orbits From Scratch | HTML | source | R code
orbitr::custom-visualization |  | Custom Visualization with ggplot2 and plotly | HTML | source | R code
orbitr::examples |  | Examples | HTML | source | R code
orbitr::further-reading |  | Further Reading | HTML | source |
orbitr::keplerian-elements |  | Keplerian Orbital Elements | HTML | source | R code
orbitr::physical-constants |  | Built-In Physical Constants | HTML | source | R code
orbitr::plotting-3d |  | 3D Plotting | HTML | source | R code
orbitr::quick-start |  | Quick Start Guide | HTML | source | R code
orbitr::reference-frames |  | Reference Frames | HTML | source | R code
orbitr::roadmap |  | Roadmap | HTML | source |
orbitr::the-physics |  | The Physics | HTML | source | R code
orbitr::unstable-orbits |  | Unstable Orbits and the Three-Body Problem | HTML | source | R code