refactor pickTemplate and adapt existing usage

src/Bundle/ChillDocGeneratorBundle/Resources/public/lib/document-generator.js

@@ -0,0 +1,13 @@
+
+const buildLink = function(templateId, entityId, entityClass) {
+    const
+        entityIdEncoded = encodeURI(entityId),
+        returnPath = encodeURIComponent(window.location.pathname + window.location.search + window.location.hash),
+        entityClassEncoded = encodeURI(entityClass),
+        url = `/fr/doc/gen/generate/from/${templateId}/for/${entityClassEncoded}/${entityIdEncoded}?returnPath=${returnPath}`
+    ;
+    console.log('computed Url');
+    return url;
+};
+
+export {buildLink};