Docs: Overview examples have incorrect requirements.txt

[lachlansimpson]

Hi Team,

While sending out a link to a customer, I noticed that there were some incorrect requirements.txt files in the examples provided in the Overview:

py-shiny-site/docs/overview.qmd

Lines 467 to 470 in 43edaa0

	## file: requirements.txt
	palmerpenguins
	plotly
	pandas

py-shiny-site/docs/overview.qmd

Lines 507 to 511 in 43edaa0

	## file: requirements.txt
	palmerpenguins
	plotly
	pandas
	```

In particular, none of the requirements.txt files on that page have shiny or shinywidgets.

Thanks!