Allow changing max columns on split columns widget

internal/assets/templates/split-column.html

@@ -3,7 +3,7 @@
 {{ define "widget-content-classes" }}widget-content-frameless{{ end }}
 
 {{ define "widget-content" }}
-<div class="masonry" data-max-columns="2">
+<div class="masonry" data-max-columns="{{ .MaxColumns }}">
 {{ range .Widgets }}
     {{ .Render }}
 {{ end }}

internal/widget/split-column.go

@@ -11,6 +11,7 @@ import (
 type SplitColumn struct {
 	widgetBase          `yaml:",inline"`
 	containerWidgetBase `yaml:",inline"`
+	MaxColumns          int `yaml:"max-columns"`
 }
 
 func (widget *SplitColumn) Initialize() error {
@@ -22,6 +23,10 @@ func (widget *SplitColumn) Initialize() error {
 		}
 	}
 
+	if widget.MaxColumns < 2 {
+		widget.MaxColumns = 2
+	}
+
 	return nil
 }