Fixed server-url issues and response with plain-text content-type

Author: mrin9

dist/index.html

@@ -18,7 +18,7 @@
   -->
 
   <rapi-doc
-    spec-url="./examples/specs/petstore3.yaml"
+    spec-url="./examples/specs/petstore.json"
     layout="row"
     theme="dark"
   >

dist/index.html.gz

@@ -18,7 +18,7 @@
   -->
 
   <rapi-doc
-    spec-url="./examples/specs/petstore3.yaml"
+    spec-url="./examples/specs/petstore.json"
     layout="row"
     theme="dark"
   >

dist/rapidoc-min.js

@@ -1,6 +1,6 @@
 {
   "name": "rapidoc",
-  "version": "5.0.3",
+  "version": "5.0.4",
   "description": "RapiDoc - Open API spec viewer with built in console",
   "author": "Mrinmoy Majumdar <[email protected]>",
   "repository": {