Update content/index.md

https://github.com/hookio
Update content/index.md
Merge pull request #63 from rak111esh/master

Hook Io 's link doesn't work
[dist] Regenerate
[fix] Load jQuery from HTTPS
[dist] Regenerate
[dist] Bump version to 0.3.4
Merge branch 'master' of github.com:nodejitsu/handbook into autogeneration
Merge branch 'autogeneration' of github.com:nodejitsu/handbook into autogeneration

Conflicts:
	public/a-quickstart/faq.html
	public/a-quickstart/hello-world.html
	public/a-quickstart/index.html
	public/api/index.html
	public/appendix/haibu.html
	public/appendix/index.html
	public/appendix/open-source.html
	public/appendix/package-json.html
	public/appendix/resources.html
	public/features/dns.html
	public/features/index.html
	public/features/jitsu.html
	public/features/webhooks.html
	public/features/webops.html
	public/index.html
	public/support.html