fix up tutorial links

docs/source/tutorial.rst

@@ -28,10 +28,8 @@ Catalog:
 
 .. ipython:: python
 
-    catalog = intake.open_stac_catalog(
-        'https://storage.googleapis.com/pdd-stac/disasters/catalog.json',
-        name='planet-disaster-data'
-    )
+    url = 'https://raw.githubusercontent.com/cholmes/sample-stac/master/stac/catalog.json'
+    catalog = intake.open_stac_catalog(url)
     list(catalog)
 
 You can also point to STAC Collections or Items. Each constructor returns a
@@ -41,17 +39,15 @@ initialization:
 .. ipython:: python
     :verbatim:
 
+    root_url = 'https://raw.githubusercontent.com/sat-utils/sat-stac/master/test/catalog'
     stac_cat = intake.open_stac_catalog(
-        'https://landsat-stac.s3.amazonaws.com/catalog.json',
-        name='landsat-stac'
+        f'{root_url}/catalog.json',
     )
     collection_cat = intake.open_stac_collection(
-        'https://landsat-stac.s3.amazonaws.com/landsat-8-l1/catalog.json',
-        name='landsat-8'
+        f'{root_url}/eo/landsat-8-l1/catalog.json',
     )
     items_cat = intake.open_stac_item(
-        'https://landsat-stac.s3.amazonaws.com/landsat-8-l1/111/111/2018-11-30/LC81111112018334LGN00.json',
-        name='LC81111112018334LGN00'
+        f'{root_url}/eo/landsat-8-l1/item.json'
     )
 
 Intake-Stac uses `sat-stac <https://github.com/sat-utils/sat-stac>`_ to parse
@@ -63,10 +59,8 @@ STAC objects. You can also pass ``satstac`` objects (e.g.
 
     import satstac
 
-    col = satstac.Collection.open(
-        'https://landsat-stac.s3.amazonaws.com/landsat-8-l1/catalog.json'
-    )
-    collection_cat = open_stac_collection(col, name='landsat-8')
+    col = satstac.Collection.open(f'{root_url}/catalog.json')
+    collection_cat = intake.open_stac_collection(url)
 
 Using the catalog
 -----------------
@@ -76,6 +70,7 @@ contents:
 
 .. ipython:: python
 
+    catalog = catalog['hurricane-harvey']['hurricane-harvey-0831']
     for id, entry in catalog.items():
         display(entry)