Adding dynamically generated URLs to the app

We now want to complete our main layout with a navigation bar, a home page link, as well as a drop-down menu for the countries. To achieve that, we introduce the NavbarSimple component from Dash Bootstrap Components and see how we can use it.

The NavbarSimple component will take a few elements to create the structure we want as follows:

1. We first create the navigation bar and give it brand and brand_href arguments, to indicate what the name would be and where it would link to:

   import dash_bootstrap_components as dbc
   dbc.NavbarSimple([
       …
   ], brand="Home", brand_href="/")

2. For its children argument, we will add a dbc.DropdownMenu component. We will also give it a label value so users know what to expect when they click on the menu. We will fill its children argument in the next step:

   dbc.DropdownMenu(children=[
       menu_item_1,
       menu_item_2...