docs: add a bit more about spatial data

[maelle]

WIP. TODOS

• Align introductory vignette with README

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.33%. Comparing base (60ba8dc) to head (d9c2e2d).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #176      +/-   ##
==========================================
+ Coverage   93.31%   93.33%   +0.01%     
==========================================
  Files           9        9              
  Lines         359      360       +1     
==========================================
+ Hits          335      336       +1     
  Misses         24       24              

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[annakrystalli]

Thanks for taking a shot at this @maelle !

I've made some suggestions to keep the language closer to WFS terminology and added some extra definitions that hopefully make it easier for folks unfamiliar with WFS to follow what's going on. It's a bit of a divergence to what we discussed last week (sorry!), but on revisiting and adding some definitions, it seemed more accurate and clear.

[maelle]

OMG this is so elegant and simple

[salvafern]

I know right? And there are more options: https://pkgs.rstudio.com/rmarkdown/reference/output_format.html#arguments-1

[maelle]

@annakrystalli thank you!!

@salvafern thank you!! I will port your edit to the .orig file and then knit it.

[salvafern]

I'm adding my review later today!
Ported the edits to .orig myself