R4R: update swagger to testnet 4000 (#369)

* feat: update swagger to testnet 4000

* feat: update server to public https address

* fix: use correct method for post price

* feat: move to separate testnet repo

swagger-ui/testnet-4000/index.html

@@ -39,7 +39,7 @@
     window.onload = function() {
       // Begin Swagger UI call region
       const ui = SwaggerUIBundle({
-        url: "./swagger.yaml",
+        url: "./swagger-testnet-4000.yaml",
         dom_id: '#swagger-ui',
         deepLinking: true,
         presets: [