Moved taiko tests to final location

test/taiko/ptf-demo/README.md

-# Prototypefund demo with taiko
-
-## Setup:
-
-    npm install -g taiko-screencast taiko
-    sudo apt install ffmpeg
-
-    export DOMAIN='oas.example.org'
-    export SSO_USERNAME='taiko-tmp'
-    export SSO_USER_PW='...'
-
-## Usage
-
-    taiko --observe ptf-demo.js
-
-### Record screencast GIF
-
-    taiko ptf-demo.js --plugin screencast
-
-* Issues: Screencast break with [MaxListenersExceededWarning](https://github.com/getgauge-contrib/taiko-screencast/issues/19)