API formheader and header update

- API header.md will code will be managed separately in slate’s
index.html.md file.
- changed curl code’s code type to shell. Give’s coloured output. in
slate output

iguana/help/formheader.md

@@ -3,7 +3,7 @@
 %s
 
 
-```curl
+```shell
 %s
 ```
 

iguana/help/header.md

@@ -1,25 +0,0 @@
----
-title: API Reference
-
-language_tabs:
-  - curl
-  - url
-
-toc_footers:
-  - <a href='http://supernet.org'>SuperNET.org</a>
-  - <a href='https://phabricator.supernet.org/'>SupernET Developer Network</a>
-
-includes:
-  - api
-  - errors
-
-search: true
----
-
-# Introduction
-
-Welcome to the SuperNET API! 
-
-Visit [SupernET Developer Network](https://phabricator.supernet.org/).
-
-SuperNET development related information goes here.