Update Pythia foundations (#73)

Author: jukent

README.md

@@ -87,7 +87,7 @@ and even change the example programs. The code cells
 have no output at first, until you execute them by pressing
 {kbd}`Shift`\+{kbd}`Enter`. Complete details on how to interact with
 a live Jupyter notebook are described in [Getting Started with
-Jupyter](https://foundations.projectpythia.org/foundations/getting-started-jupyter.html).
+Jupyter](https://foundations.projectpythia.org/foundations/getting-started-jupyter).
 
 ### Running on Your Own Machine
 

notebooks/advanced/Parquet_Reference_Storage.ipynb

@@ -35,7 +35,7 @@
     "| [Basics of virtual Zarr stores](../foundations/01_kerchunk_basics.ipynb) | Required | Core |\n",
     "| [Multi-file virtual datasets with VirtualiZarr](../foundations/02_kerchunk_multi_file.ipynb) | Required | Core |\n",
     "| [Parallel virtual dataset creation with VirtualiZarr, Kerchunk, and Dask](../foundations/03_kerchunk_dask) | Required | Core |\n",
-    "| [Introduction to Xarray](https://foundations.projectpythia.org/core/xarray/xarray-intro.html) | Required | IO/Visualization |\n",
+    "| [Introduction to Xarray](https://foundations.projectpythia.org/core/xarray/xarray-intro) | Required | IO/Visualization |\n",
     "\n",
     "- **Time to learn**: 30 minutes\n",
     "---"

notebooks/foundations/01_kerchunk_basics.ipynb

@@ -37,7 +37,7 @@
     "## Prerequisites\n",
     "| Concepts | Importance | Notes |\n",
     "| --- | --- | --- |\n",
-    "| [Introduction to Xarray](https://foundations.projectpythia.org/core/xarray/xarray-intro.html) | Helpful | Basic features |\n",
+    "| [Introduction to Xarray](https://foundations.projectpythia.org/core/xarray/xarray-intro) | Helpful | Basic features |\n",
     "\n",
     "- **Time to learn**: 60 minutes\n",
     "---"

notebooks/foundations/02_kerchunk_multi_file.ipynb

@@ -37,7 +37,7 @@
     "| Concepts | Importance | Notes |\n",
     "| --- | --- | --- |\n",
     "| [Basics of virtual Zarr stores](./01_kerchunk_basics.ipynb) | Required | Basic features |\n",
-    "| [Introduction to Xarray](https://foundations.projectpythia.org/core/xarray/xarray-intro.html) | Recommended | IO |\n",
+    "| [Introduction to Xarray](https://foundations.projectpythia.org/core/xarray/xarray-intro) | Recommended | IO |\n",
     "\n",
     "- **Time to learn**: 60 minutes\n",
     "---"

notebooks/foundations/03_kerchunk_dask.ipynb

@@ -36,7 +36,7 @@
     "| --- | --- | --- |\n",
     "| [Basics of virtual Zarr stores](./01_kerchunk_basics.ipynb) | Required | Core |\n",
     "| [Multi-file virtual datasets with VirtualiZarr](./02_kerchunk_multi_file.ipynb) | Required | Core |\n",
-    "| [Introduction to Xarray](https://foundations.projectpythia.org/core/xarray/xarray-intro.html) | Recommended | IO/Visualization |\n",
+    "| [Introduction to Xarray](https://foundations.projectpythia.org/core/xarray/xarray-intro) | Recommended | IO/Visualization |\n",
     "| [Intro to Dask](https://tutorial.dask.org/00_overview.html) | Recommended | Parallel Processing |\n",
     "\n",
     "- **Time to learn**: 45 minutes\n",

notebooks/generating_references/GRIB2.ipynb

@@ -44,7 +44,7 @@
     "| [Kerchunk Basics](../foundations/kerchunk_basics) | Required | Core |\n",
     "| [Multiple Files and Kerchunk](../foundations/kerchunk_multi_file) | Required | Core |\n",
     "| [Kerchunk and Dask](../foundations/kerchunk_dask) | Required | Core |\n",
-    "| [Introduction to Xarray](https://foundations.projectpythia.org/core/xarray/xarray-intro.html) | Required | IO/Visualization |\n",
+    "| [Introduction to Xarray](https://foundations.projectpythia.org/core/xarray/xarray-intro) | Required | IO/Visualization |\n",
     "- **Time to learn**: 45 minutes\n",
     "---"
    ]

notebooks/generating_references/GeoTIFF.ipynb

@@ -35,7 +35,7 @@
     "| [Basics of virtual Zarr stores](../foundations/01_kerchunk_basics.ipynb) | Required | Core |\n",
     "| [Multi-file virtual datasets with VirtualiZarr](../foundations/02_kerchunk_multi_file.ipynb) | Required | Core |\n",
     "| [Parallel virtual dataset creation with VirtualiZarr, Kerchunk, and Dask](../foundations/03_kerchunk_dask) | Required | Core |\n",
-    "| [Introduction to Xarray](https://foundations.projectpythia.org/core/xarray/xarray-intro.html) | Required | IO/Visualization |\n",
+    "| [Introduction to Xarray](https://foundations.projectpythia.org/core/xarray/xarray-intro) | Required | IO/Visualization |\n",
     "- **Time to learn**: 30 minutes\n",
     "---"
    ]

notebooks/generating_references/NetCDF.ipynb

@@ -38,7 +38,7 @@
     "| [Basics of virtual Zarr stores](../foundations/01_kerchunk_basics.ipynb) | Required | Core |\n",
     "| [Multi-file virtual datasets with VirtualiZarr](../foundations/02_kerchunk_multi_file.ipynb) | Required | Core |\n",
     "| [Parallel virtual dataset creation with VirtualiZarr, Kerchunk, and Dask](../foundations/03_kerchunk_dask) | Required | Core |\n",
-    "| [Introduction to Xarray](https://foundations.projectpythia.org/core/xarray/xarray-intro.html) | Required | IO/Visualization |\n",
+    "| [Introduction to Xarray](https://foundations.projectpythia.org/core/xarray/xarray-intro) | Required | IO/Visualization |\n",
     "- **Time to learn**: 45 minutes\n",
     "---"
    ]

notebooks/using_references/Hvplot_Datashader.ipynb

@@ -24,7 +24,7 @@
     "| Concepts | Importance | Notes |\n",
     "| --- | --- | --- |\n",
     "| [Kerchunk Basics](../foundations/kerchunk_basics) | Required | Core |\n",
-    "| [Introduction to Xarray](https://foundations.projectpythia.org/core/xarray/xarray-intro.html) | Required | IO |\n",
+    "| [Introduction to Xarray](https://foundations.projectpythia.org/core/xarray/xarray-intro) | Required | IO |\n",
     "| [Introduction to hvPlot](https://hvplot.holoviz.org/) | Required | Data Visualization |\n",
     "| [Introduction to Datashader](https://datashader.org/index.html) | Required | Big Data Visualization |\n",
     "- **Time to learn**: 10 minutes\n",