Address feedback from CRAN submission

- Put the CRAN URL that the badge points to into canonical form. I had
  missed the requirement to use the canonical form before, as the R CMD
  check message complained about a (possibily) invalid URL, so I
  overlooked the explanation later in the check log. Thanks to Uwe for
  his patience. Fix checked with winbuilder.

- Slightly reduced the build time for the compiled_models vignette by
  skipping the warm-up. 3 repetitions are necessary for the autoplot
  method to work

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