dev-api: add developer portal, OpenAPI spec, and Flatenbadet case study

- New /developers/ page with API docs, SDKs, pricing, use cases
- OpenAPI 3.0 spec for Orders, Missions, Photos, Analytics
- Case study: Glasskiosken i Flatenbadet — complete ROI analysis
- Updated /order/ with recurring missions and frequency dropdown

services/frilans-payout/node_modules/js-yaml/lib/schema/failsafe.js

@@ -0,0 +1,14 @@
+// Standard YAML's Failsafe schema.
+// http://www.yaml.org/spec/1.2/spec.html#id2802346
+
+'use strict'
+
+const Schema = require('../schema')
+
+module.exports = new Schema({
+  explicit: [
+    require('../type/str'),
+    require('../type/seq'),
+    require('../type/map')
+  ]
+})