Port the UI to Vue.js

[kraih]

Performance issues are becoming more common with our current UI. Especially the AJAX driven tables are a big problem once the data sets reach a certain size. We've learned a lot about how to make better performing UIs with Vue.js for the QEM Dashboard. Those lessons should be applied to Cavil as well.

[kraih]

The first step would be the introduction of Mojolicious::Plugin::Webpack. Then the frontpage showing the current review backlog could be converted, since it is the main performance bottleneck at the moment. The main legal report page would also benefit a lot, but is not as urgent.

[kraih]

We are now using Webpack, and the open reviews/recent reviews pages have been converted to Vue.js. Still a lot more to do, but it's a good start. The legacy JavaScript code is also cleanly separated from the new code.

[kraih]

All legacy DataTables have been replaced with Vue.js components. There's quite a bit of redundant code/markup that should be removed in the future though. And of course the main report page still remains to be ported.