Put footer content back into prescribed columns

app/templates/admin_template.html

@@ -147,7 +147,7 @@
   {{ notify_footer({
     "navigation": [
       {
-        "columns": 4,
+        "columns": 1,
         "items": [
           {
             "href": url_for('main.support'),
@@ -168,7 +168,12 @@
           {
             "href": "https://gds.blog.gov.uk/category/notify/",
             "text": "Blog"
-          },
+          }
+        ]
+      },
+      {
+        "columns": 1,
+        "items": [
           {
             "href": url_for("main.features"),
             "text": "Features"
@@ -192,7 +197,12 @@
           {
             "href": url_for("main.terms"),
             "text": "Terms of use"
-          },
+          }
+        ]
+      },
+      {
+        "columns": 1,
+        "items": [
           {
             "href": url_for("main.pricing"),
             "text": "Pricing"
@@ -200,7 +210,12 @@
           {
             "href": url_for("main.how_to_pay"),
             "text": "How to pay"
-          },
+          }
+        ]
+      },
+      {
+        "columns": 1,
+        "items": [
           {
             "href": url_for("main.documentation"),
             "text": "Documentation"