Vignettes and other documentation

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Vignettes from package 'crul'

crul::async		3. async with crul	HTML	source
crul::best-practices-api-packages		5. API package best practices	HTML	source
crul::choosing-a-client		6. Choosing a HTTP request class	HTML	source
crul::crul		1. crul introduction	HTML	source
crul::curl-options		4. curl options	HTML	source
crul::how-to-use-crul		2. crul workflows	HTML	source