add font option into the confg.ini.php #18602

@froger-me request adding font config into the config.ini.php. Details are here.
https://github.com/matomo-org/matomo/issues/18465#issuecomment-1009607995
app/core/Mail/EmailStyles.php
app/core/ReportRenderer/Pdf.php
app/core/ReportRenderer.php

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