Closes #484 roclet: Implement rdx roclet #1199

Job	Run time
Get R version	2s
Check / (release)	2m 57s
Check / (oldrel)	2m 59s
Links / Validate Links	13s
Check / (devel)	49s
Version Bump 🤜🤛	-1s
Validation	-1s
Code Style / Code Style	1m 8s
Spelling / Spellcheck	59s
Documentation	-1s
Code Coverage / Test Coverage	1m 34s
Lint / Lint	1m 4s
Man Pages / Roxygen	1m 0s
Code Coverage / Generate badge for coverage	6s
	12m 48s

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