Fix plot issues in pkgdown

[stefaneng]

There are some strange issues with pkgdown plots. The issues differ depending on if building locally or via github actions. Some of the issues can be seen here:

https://github.com/uclahs-cds/public-R-BoutrosLab-plotting-general/commit/aded1654f83a6669a6b347af02b504e679a2d769

• Some plots are black when generating on github actions
• Some plots lose white background (github actions)
• Multipanel plots are incorrect dimensions (happens on both local and github actions)

For now I have reverted back to the manually updated pkgdown plots but will look into why it generates the plots incorrectly.

[lydiayliu]

The last two example figures for create.dotmap are also not generated: https://uclahs-cds.github.io/public-R-BoutrosLab-plotting-general/reference/create.dotmap.html

[stefaneng]

@lydiayliu Oh, good catch. I think it is due to that rogue dev.off() call right above it.