Update index.html.erb
Update index.html.erb

2 things:
1 - trying out a new hero tagline
2 - fixed some errors in the "plugins" section, which now has 2 placeholder links that need to be made into real links
arvindsv/www.go.cd,ketan/www.go.cd,arvindsv/gocd.github.io,markandan/www.go.cd,gocd/www.go.cd,gocd/gocd.github.io,gocd/gocd.github.io,markandan/www.go.cd,GaneshSPatil/www.go.cd,arvindsv/www.go.cd,ketan/www.go.cd,ketan/gocd.github.io,GaneshSPatil/www.go.cd,GaneshSPatil/www.go.cd,nyuday/www.go.cd,nyuday/www.go.cd,arvindsv/www.go.cd,gocd/www.go.cd,gocd/www.go.cd,gocd/gocd.github.io,nyuday/www.go.cd,arvindsv/gocd.github.io,ketan/gocd.github.io,jyotisingh/www.go.cd,arvindsv/gocd.github.io,ketan/www.go.cd,jyotisingh/www.go.cd,ketan/gocd.github.io,gocd/www.go.cd,markandan/www.go.cd,GaneshSPatil/www.go.cd,jyotisingh/www.go.cd,gocd/gocd.github.io