startup message to find functions

[topepo]

Too much?

[juliasilge]

I made the edits we talked about here @topepo, going up to five startup messages:

• Search for functions across packages at https://www.tidymodels.org/find/
• Learn how to get started at https://www.tidymodels.org/start/
• Use tidymodels_prefer() to resolve common conflicts.
• Dig deeper into tidy modeling with R at https://www.tmwr.org
• Use suppressPackageStartupMessages() to eliminate package startup messages

I did not use browseURL() because it doesn't do anything for me from the console and I have to copy/paste anyway; I think it's nicer to just have the URL printed there. These are all pretty short and memorable anyway.

[topepo]

Looks great.

[github-actions]

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