🐛 headings prop in writer field, thanks @marcogeue

closes #42

Signed-off-by: Bruno Meilick <b@bnomei.com>

Author: bnomei

kirby5-blueprints.schema.json

@@ -1139,6 +1139,20 @@
         "description": "Sets the font family (sans or monospace)",
         "default": "sans"
       },
+      "@headings": {
+        "type": "array",
+        "items": {
+          "type": "integer",
+          "enum": [
+            1,
+            2,
+            3,
+            4,
+            5,
+            6
+          ]
+        }
+      },
       "@headline": {
         "$ref": "#/$defs/nonEmptyString"
       },
@@ -4375,6 +4389,9 @@
           "disabled": {
             "$ref": "#/$defs/field-properties/@disabled"
           },
+          "headings": {
+            "$ref": "#/$defs/field-properties/@headings"
+          },
           "help": {
             "$ref": "#/$defs/field-properties/@help"
           },