feat: implement hero section using Pkl

pkg/nebula/models/common.go

@@ -1 +1,36 @@
 package models
+
+import (
+	"context"
+	"errors"
+
+	"github.com/apple/pkl-go/pkl"
+)
+
+var models *Models
+
+func LoadFromString(ctx context.Context, s string) (err error) {
+	evaluator, err := pkl.NewEvaluator(ctx, pkl.PreconfiguredOptions)
+	if err != nil {
+		return err
+	}
+	defer func() {
+		cerr := evaluator.Close()
+		if err == nil {
+			err = cerr
+		}
+	}()
+	ret, err := Load(ctx, evaluator, pkl.TextSource(s))
+	if err != nil {
+		return err
+	}
+	models = ret
+	return nil
+}
+
+func GetModels() (*Models, error) {
+	if models == nil {
+		return nil, errors.New("models not initialized")
+	}
+	return models, nil
+}