Fix/deactivate pwa prompt

[Stef-Rousset]

🎩 Description

The aim of this PR is to deactivate pwa prompt, by setting pwaInstallPromptSeen variable to true in localStorage (cf decidim-core/app/packs/src/sw/a2hs.js which the file where the prompt is launched)

📌 Related Issues

• Fixes Deactivate PWA feature #99?

Testing

Go to develop branch and see if you can get the prompt (cf screenshot one). I wasn't able to get it in local env or in docker...
Go back to the PR branch
If you have the prompt, to test this PR, you can follow these steps:

1. in FO, navigate on different pages and see that you never get the prompt
2. check in dev tools, in Application tab localStorage that the pwaInstallPromptSeen is set to true (cf screenshot two)

If you don't have the prompt, to test this PR, you can follow these steps:
In local env:

1. in FO, go to the dev tools, in Application tab
2. see that in localStorage, you have the pwaInstallPromptSeen set to true (cf screenshot two)
3. click on other pages, open a page in a new tab and check that the variable is still present

Then, in https://petitions.lecese.fr

1. go to dev tools, and in Console tab, execute this command localStorage.setItem("pwaInstallPromptSeen", true) (cf screenshot three)
2. check in localStorage that pwaInstallPromptSeen variable is set to true
3. navigate on different pages and see that you never get the prompt

📷 Screenshots

ONE =>

TWO =>

THREE =>

[Quentinchampenois]

JS condition could have been 👍 :

!localStorage.getItem("pwaInstallPromptSeen")