Add another column and extra links to home page

assets/css/home.scss

@@ -26,11 +26,15 @@
 
 .home-page .book-columns {
     text-align: center;
+    justify-content: space-evenly;
 }
 
 .home-page .column {
     text-align: center;
     margin: var(--oe-padding-small);
+    flex-basis: 18em;
+    flex-grow: 0;
+    flex-shrink: 0;
 }
 
 .home-page .column sl-icon {

content/_index.md

@@ -49,15 +49,25 @@ Ecoacoustic monitoring provides a non-invasive, complementary strategy to other
 
 ### Data
 
-Ecoacoustic data provides a record of soniferous fauna allowing the answering of ecological questions such as species occupancy, abundance, behaviour, species richness, and showing trends over time and space. See examples of [repositories](/resources/repositories/) of Ecoacoustic data.
+Ecoacoustic data provides a record of soniferous fauna allowing the answering of ecological questions such as species occupancy, abundance, behaviour, species richness, and showing trends over time and space. See examples of [repositories](/resources/software/repositories/) of Ecoacoustic data.
 
 <--->
 
 <sl-icon name="gear"></sl-icon>
 
 ### Tools
 
-Ecoacoustic data collection and analysis is supported by a range of hardware and software, enabling data management and sharing, as well as sense-making by analysts in both the present and the future.
+Ecoacoustic data collection and analysis is supported by a range of hardware and [software](/resources/software)
+enabling data management and sharing, as well as sense-making by analysts in both the present and the future.
+We maintain a [registry](/resources/registry) recognisers for Ecoacoustic data.
+
+<--->
+
+<sl-icon name="journals"></sl-icon>
+
+### Training
+
+Lessons and modules for working with Ecoacoustic data from the basics to making your own automated call recogniser. See our collection of [lessons](/resources/lessons/).
 
 {{< /columns >}}
 {{< /home/section >}}