find out a easier way to do sorting category --}}

[todo]

https://github.com/shijiezhou1/Ember-Blog/blob/db8279e3ddf4dbb1ab6e511234f94d76fbe20b8e/app/templates/components/sidebar-left.hbs#L1-L4

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This issue was generated by todo based on a TODO comment in db8279e. It's been assigned to @shijiezhou1 because they committed the code.