Reorgranised blade view files to form a convention

- Primarily moved and re-organised view files.
- Included readme within views to document the convention.
- Fixed some issues with page field select list in previous commit.
- Tweaked some route names while going through.
- Split some views out further.

Closes #2805

resources/views/common/custom-head.blade.php

@@ -0,0 +1,5 @@
+@if(setting('app-custom-head') && \Route::currentRouteName() !== 'settings')
+<!-- Custom user content -->
+{!! setting('app-custom-head') !!}
+<!-- End custom user content -->
+@endif