Clarify commands for continuous build
The aim of this change is to better communicate the steps needed to run ARSnova mobile and backend continuously. The essential steps are to first start the Jetty server, and then to use Grunt to start a proxy and to watch the file system. Previously, the section was a bit ambiguous as to what the exact order of the commands is. For example, `grunt build` is not part of the continuous build process, but was mentioned in this section.
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