Sulu 2.0 Documentation Update

[danrot]

• [ ] Add own .babelrc file to your installation
• [ ] Update your webpack configuration to include your own JS files
• [ ] How to implement your own view
• [ ] How to implement your own Datagrid Adapter
• [ ] How to add routes to Frontend in the Admin
  • [ ] Mandatory parameters in URL
  • [ ] Optional parameters as query parameters
• [ ] FormInspector functionality in FieldTypes (should also be added in styleguidist documentation, see PR https://github.com/sulu/sulu/pull/4020)
• [ ] Adding custom forms and list XMLs (including fragments, which unlike for pages are not allowed to be placed in a subfolder of config/forms)