feat: add Schema platform page

[AgostinoPurificato]

Description

This PR aims to add the platform page for the schema.gov.it project

CC: @mfortini @Clou-dia

[AgostinoPurificato]

@Clou-dia the failed test on this PR refers to libraries that can't be downloaded because they are missing from the relative repositories.

E: Unable to locate package gconf-service
E: Package 'libasound2' has no installation candidate
E: Unable to locate package libgconf-2-4
E: Unable to locate package libappindicator1

@mfortini Could you please support us to identify the problem and if it is related to commits in this PR?

[mfortini]

We need to fix the test script. Meanwhile, focus on the preview