[openstreetmap/openstreetmap-website] Block mapy.cz as non-approved imagery (Issue #4085)

[Jakub Jelen]

### Problem

Some users in Czechia are using mapy.cz satellite imagery which is not approved for mapping.

### Description

This was originally reported in openstreetmap/iD#9708 but it looks like they do not have a way to fix it on their side and it should be done here.

### Screenshots

_No response_

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