Fix docs build for visualization functions (#172)

Author: gjoseph92

pdm.lock

@@ -31,6 +31,7 @@ viz = [
     "scipy<2.0.0,>=1.6.1",
     "ipyleaflet<1.0.0,>=0.13.6",
     "ipywidgets<8.0.0,>=7.6.3",
+    "matplotlib>=3.4.1",
 ]
 
 [tool.pdm.dev-dependencies]
@@ -41,7 +42,6 @@ binder = [
     "jupyter-server-proxy>=3.2.0",
     "jupyterlab-geojson>=3.1.2",
     "jupyterlab-system-monitor>=0.8.0",
-    "matplotlib>=3.4.1",
     "planetary-computer>=0.4.3",
     "pystac-client>=0.3",
     "sat-search>=0.3.0",