Changes to be made in the vignette

[njtierney]

Vignettes

Changes to the vignettes to address reviewer comments in onboarding review

• [X] Link to vignettes (https://github.com/njtierney/visdat/commit/435154685d4f1e78dd8a03d00ba2f1b90dae39de)
• [X] introduce airquality at first usage (https://github.com/njtierney/visdat/commit/58529ef005297b1fe5a3e412e4a1f983f631234d)
• [X] sentence about <0.1% of missingness and >1% missingness (https://github.com/njtierney/visdat/commit/58529ef005297b1fe5a3e412e4a1f983f631234d)
• [X] Change figure size in experimental vignette: knitr::opts_chunk$set(fig.width = 5, fig.height = 4) (https://github.com/njtierney/visdat/commit/bcb01a760d36ad821e7fd9eaa4463ffa3daa3b2c)
• [X] move visdat_ly() and vis_miss_ly() to the experimental vignette. (https://github.com/njtierney/visdat/commit/435154685d4f1e78dd8a03d00ba2f1b90dae39de)
• [x] Make sure that the excessive warning messages are fixed
• [x] Decide whether I really need to discuss the figure from R4DS.