Early chapter updates

[ismayc]

• Use base-pipe |> instead of %>% in all code chunks except for Chapters 7-10 since those are in other updates.
• Address the warning message explicitly for group_by() in text and fix index.Rmd to remove options(dplyr.summarise.inform = FALSE)
• Add relocate() to end of Chapter 3
• Add envoy_flights and early_january_2023_weather to {moderndive} package
• Explain that {nycflights23} is an updated version of {nycflights13} using the {anyflights} package
• Updated code and discussion throughout the book to use {nycflights23} instead of {nycflights13}

[ismayc]

@avaldivi6 @rudeboybert These changes have also been incorporated in my update of Chapter 5 with new datasets. I'm going to close this PR and start a new one into master from the ch5-updates branch.