Fit 01_Cartopy_Intro notebook to proposed Foundations template (#57)

* Fit template to cartopy notebook

Co-authored-by: Brian Rose <brose@albany.edu>

Author: ktyle

core/cartopy.md

@@ -1,22 +1,21 @@
 # Cartopy
 
-```{note}
-This content is under construction!
-```
-
-This section contains tutorials on plotting maps with [cartopy](https://scitools.org.uk/cartopy/docs/latest/).
-It will be cross-referenced with tutorials on [xarray](xarray) and [matplotlib](matplotlib).
+This section contains tutorials on plotting maps with [Cartopy](https://scitools.org.uk/cartopy/docs/latest/).
+It will be cross-referenced with tutorials on [Xarray](xarray) and [Matplotlib](matplotlib).
 
 ---
 
 From the [Cartopy website](https://scitools.org.uk/cartopy/docs/latest):
-Cartopy is a Python package designed for geospatial data processing in order to
-produce maps and other geospatial data analyses.
 
-Cartopy makes use of the powerful PROJ.4, NumPy and Shapely libraries and includes a programmatic interface
-built on top of Matplotlib for the creation of publication quality maps.
+> Cartopy is a Python package designed for geospatial data processing in order to
+> produce maps and other geospatial data analyses.
+>
+> Cartopy makes use of the powerful PROJ.4, NumPy and Shapely libraries and includes a programmatic interface
+> built on top of Matplotlib for the creation of publication quality maps.
+>
+> Key features of Cartopy are its object-oriented [projection definitions](https://scitools.org.uk/cartopy/docs/latest/crs/projections.html#cartopy-projections),
+> and its ability to transform points, lines, vectors, polygons and images between those projections.
 
-You should have a basic familiarity with Matplotlib prior to working through the Cartopy notebooks presented here.
+You should have a basic familiarity with [Matplotlib](matplotlib) prior to working through the Cartopy notebooks presented here.
 
-Key features of cartopy are its object-oriented [projection definitions](https://scitools.org.uk/cartopy/docs/latest/crs/projections.html#cartopy-projections),
-and its ability to transform points, lines, vectors, polygons and images between those projections.
+Cartopy's cartographic features library includes shapefiles directly served by [Natural Earth](https://www.naturalearthdata.com/).