Add search bar to homepage

# Overview

Add the search bar to the homepage. We have not selected a autocomplete library nor a place lookup, but please do your best to add the functionality for the drop downs shown in the wireframes below. This does not include adding search functionality yet (though if you have a solution in mind for that please go ahead)

# Wireframes/Screenshot (optional)

From [Miro](https://miro.com/app/board/uXjVMWaM07U=/?moveToWidget=3458764553393749590&cot=14)

# Context

Blocked by #26 & #27

# Suggested solution (optional)

Bootstrap doesn't seem to ave a straightforward Search component, but the [Input Group](https://react-bootstrap.netlify.app/docs/forms/input-group) may have something we could use. I recommend looking through the Bootstrap documentation to find something useable.

Inizia dall’implementazione della homepage e rivedi il wireframe Miro collegato e la documentazione di React-Bootstrap Input Group. Conferma il comportamento del dropdown e le scelte relative al componente o alla libreria dopo che i blockers #26 e #27 sono stati risolti; completato significa che l’UI della barra di ricerca della homepage corrisponde al wireframe senza richiedere funzionalità di ricerca.

Scritto dal modello di indicizzazione a partire dal testo della issue.