Use new grid syntax (#600)

Author: jarrodmillman

content/_index.md

@@ -2,55 +2,55 @@
 title:
 ---
 
-{{< grid columns="1 2 2 3" >}}
+{{< grid1 columns="1 2 2 3" >}}
 
-{{< card >}}
+[[item]]
+type = 'card'
 title = 'SPECs'
 body = '''
 [Scientific Python Ecosystem Coordination]({{% relref "/specs" %}}) documents are a mechanism by which practices are
 discussed and propagated throughout the ecosystem.
 '''
-{{< /card >}}
 
-{{< card >}}
+[[item]]
+type = 'card'
 title = 'Summits'
 body = '''
 At the [summits]({{% relref "/summits" %}}), we get together both virtually and in-person
 to plan and do ecosystem work.
 '''
-{{< /card >}}
 
-{{< card >}}
+[[item]]
+type = 'card'
 title = 'Development Guide'
 body = '''
 Read this [community-maintained guide](https://learn.scientific-python.org/development/)
 to learn best practices for library development.
 '''
-{{< /card >}}
 
-{{< card >}}
+[[item]]
+type = 'card'
 title = 'Lecture Notes'
 body = '''
 Learn or teach how to use the scientific Python ecosystem with
 [classroom-style lecture notes](https://lectures.scientific-python.org).
 '''
-{{< /card >}}
 
-{{< card >}}
+[[item]]
+type = 'card'
 title = 'Sparse Arrays'
 body = '''
 One of our current focuses is on improving and maintaining the
 [sparse array]({{% relref "/grants/sparse_arrays" %}}) capabilities and
 interoperability in the ecosystem.
 '''
-{{< /card >}}
 
-{{< card >}}
+[[item]]
+type = 'card'
 title = 'Community'
 body = '''
 Our [community efforts]({{% relref "/community" %}}) focus
 on broadening participation and better coordinating volunteer efforts.
 '''
-{{< /card >}}
 
-{{< /grid >}}
+{{< /grid1 >}}