Added new DILA api route to get mairie info

[antoineludeau]

Context

The api used to get "mairie" information (name, email, telephone and opening hours) is now deprecated : https://api.gouv.fr/les-api/api_etablissements_publics (deprecated)
The new API to use is the one from the DILA : https://api.gouv.fr/les-api/api-annuaire-administration-services-publics

Enhancement

This PR :

• Replace the deprecated api by the DILA api
• Format the result to get same format used in our code to display "mairie" information.

How to test

1- Clone this branch and start the app
2- Scroll down the main page in the section "Obtenez des informations sur les adresses d’une commune" and search for any "commune". Select a "commune" : it will open the "commune" page with all the related info. (exemple for "Bordeaux" : localhost:5000/commune/33063 <= adapt the port if you are running the app on another port than 5000)
3- Scroll down the "commune" page to the section "Contacter la commune" and click on the button "Contacter la mairie".
4- It opens a modal with the "mairie" information : name, email, phone number and opening hours

5- You can also go to the "contact" page : http://localhost:5000/nous-contacter <= adapt the port if you are running the app on another port than 5000
6- Click on the button : "Je suis un particulier ou une entreprise et j’ai constaté une adresse manquante ou incorrecte."
7- In the search field, enter a "commune" and click on the selected one.
8- It should display the "mairie" information also.