Major documentation changes

[CeresBarros]

vignettes, missing doc on exported funs, pkgdown website

other bugfixes and changes:

• cache fixes
• log-transformation added to QA check (data processing script)

#121
#172
#102
#100
#107 -- another cache fix

[codecov-commenter]

Codecov Report

Attention: 24 lines in your changes are missing coverage. Please review.

Comparison is base (453a91f) 78.57% compared to head (e09cb7a) 78.78%.

❗ Current head e09cb7a differs from pull request most recent head d967909. Consider uploading reports for the commit d967909 to get more accurate results

Files	Patch %	Lines
R/climr_downscale.R	79.09%	23 Missing ⚠️
R/downscale.R	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             devl     #204      +/-   ##
==========================================
+ Coverage   78.57%   78.78%   +0.21%     
==========================================
  Files          22       23       +1     
  Lines        1806     1824      +18     
==========================================
+ Hits         1419     1437      +18     
  Misses        387      387              

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[CeresBarros]

All tests passed when they were run in d967909.
The subsequent failures and cancelled jobs came from my attempts to turn of test/example checking in a PR flow. I was not successful and reverted these changes to a simpler way of turning tests of for in a push flow.