initial changes for responsiveness

[Davy-c]

• fix HMR on dev: moved RouterProvider one step up to keep the state ( prevents reloading on previous page etc..)
• Remove blocking global data fetch, added loaders to compensate
• Remove blocking page data fetch, added loaders for ux
• Remove fetch initial props on pageProps query change but with same pathname ( shallow push )
• Remove blocking nav initial load check, added loaders in dashboard to compensate
• Remove obsolete cache in resource page
• Remove blocking editor data loading
• Added loader for sidebar tree, breadcrumb, editor load, folder pages..

[Rokt33r]

I don't think we need this component. We can use each Loader component directly where it should be placed.
Also, it will make further improvements like code splitting and tree shaking more difficult.