Fa font on the ouisync website needs to be changed

[IvanaBlzvc]

According to the RM issue 31981, "For the Persian translation of the Ouisync website, the default system font is used, which can look really terrible. We should set it to use the same font that was used on the new Ceno website."

Checked with MO, it is still pending

[paidforby]

Attempted to fix with this commit, 96e8153, but it still seems like the Vazirmatn font is not being using. Further investigation is needed.