Reference to survdat.rdata in GBSurveySet.Rmd prevents knit

[andybeet]

GBSurveySet.Rmd wont knit due to survdat.rdata not being present.
May need to rework the code chunk

This currently prevents package down to build

[sgaichas]

As a quick workaround, I've referenced survdat_Albatross.RData in the Rmd and added one more line to get pkgdown::build_site to work locally. This makes the figure with only the Albatross data, because I think the original survdat converted to Albatross units for the entire time series. I think the new truncated time series still makes the point that the options result in similar estimates. This should still work on the real site as a temporary fix.

We could either leave it this way, or add another code chunk examining the Bigelow data the same way, or do something more complex to knit the survey time series back together just for this figure (or reference that dataset if we choose to include that for the MSSPM crew). I think I'll leave that call to @slucey