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What kind of change does this PR introduce? (check one with "x")

• Bug fix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Other... Please describe:

Does this PR introduce a breaking change? (check one with "x")

• Yes
• No

Description

Load the font from cdn.

• When using google, theme will load Roboto & Material Icon from fonts.googleapi.com, while Font-Awesome will load from MaterialCDN or local.
• When using baomitu, all the fonts will load from cdn.baomitu.com.

All of them are SSL supported. And cdn.baomitu.com is with HTTP/2 enabled while font.googleapi.com is with h2+quic 37 enabled.

I change the font-family settings variable as well, which may cause BREAKING CHANGES.

Verification steps

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