change gitignore

ignore .idea folder for my working place…
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1. add disqus script to index.shtml…
2. Demo: http://students.thenet.ca/bliu/project/index.shtml
3. Won’t work on your local host…
4. TODO: need to update the final url of our project for disqus…
(currently, I use “http://students.thenet.ca/bliu/project”)