API: Re-ordered routes, Improved navigation

Updated route order to follow some kind of logic.
Updated scrolling sidebar to not be so cut-off in various scenarios.
Added new nav helper to quick jump to specific API models.

Closes #5865

resources/js/components/index.ts

@@ -1,6 +1,7 @@
 export {AddRemoveRows} from './add-remove-rows';
 export {AjaxDeleteRow} from './ajax-delete-row';
 export {AjaxForm} from './ajax-form';
+export {ApiNav} from './api-nav';
 export {Attachments} from './attachments';
 export {AttachmentsList} from './attachments-list';
 export {AutoSuggest} from './auto-suggest';