Unfortunately, a community edition doesn’t seem possible right now, mainly because WebStorm’s features are included in our paid IDEs. If we made such a radical change, we’d have to restructure a lot of other things. That’s a significant commitment we aren’t ready to make at the moment.
We try to support the community in other ways, such as by giving subscriptions to open-source projects and students: https://www.jetbrains.com/webstorm/buy/#discounts. You can also try our EAP builds, which are free to use and are available three times a year: https://www.jetbrains.com/resources/eap/.