Update the vignette on stats

[tpoisot]

Closes #48

📖 https://poisotlab.github.io/SpeciesDistributionToolkit.jl/previews/PR58/

[codecov-commenter]

Codecov Report

Base: 0.00% // Head: 0.00% // No change to project coverage 👍

Coverage data is based on head (522b211) compared to base (3f85e8f).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@          Coverage Diff          @@
##            main     #58   +/-   ##
=====================================
  Coverage   0.00%   0.00%           
=====================================
  Files          5       6    +1     
  Lines        228     240   +12     
=====================================
- Misses       228     240   +12     

Flag	Coverage Δ
unittests	0.00% <0.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/SpeciesDistributionToolkit.jl	0.00% <ø> (ø)
src/integrations/datasets_layers.jl	0.00% <0.00%> (ø)
src/io/geotiff.jl	0.00% <0.00%> (ø)
src/io/read_write.jl	0.00% <0.00%> (ø)

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