Change to webshot2

[LukasWallrich]

If you want to take up my suggestion in #58, this PR solves the problem

library(namedropR)
drop_name_crossref("https://doi.org/10.1037/bul0000315", export_as = "png")
#> No cite_key specified. Working through all possible 1 entries in the bibliography.
#> Registered S3 method overwritten by 'webshot2':
#>   method        from   
#>   print.webshot webshot
#> [1] "visual_citations/Götz_2020.html.png"

^{Created on 2022-12-11 with reprex v2.0.2}

[LukasWallrich]

Closing this to squash the commits and document