Use local fonts rather than google CDN

[jancborchardt]

@Jc-L thank you for the contribution! :)

We should actually even not rely on Google for the font delivery. We already have them in the fonts folder at https://github.com/opensourcedesign/opensourcedesign.github.io/tree/master/fonts – do you mind adjusting the pull request to load the fonts from that folder instead? :)

[Jc-L]

@jancborchardt & @RDIL : pull request updated

[RDIL]

I’ve updated the PR title so it is more accurate.

[jancborchardt]

@elioqoshi yeah, I guess it’s not needed to include the Vietnamese character set. Wanna remove it?