resolves #213 add Cyrillic fonts
Antora is my first experience with AsciiDoc, so I was confused when the word between the asterisks didn't appear in bold. The reason was that the word was in Cyrillic and Antora Default UI doesn't have Cyrillic fonts by default.
I took screenshots to demonstrate the problem.
Source: *alphabet* *алфавит* _alphabet_ _алфавит_
Including Cyrillic fonts in the default UI should make Antora experience smoother for about 5% of website creators who write in Russian, Ukrainian, Bulgarian, Serbian.
P.S. Since adding Cyrillic fonts makes ui-bundle.zip a bit larger, shouldn't we remove all .woff files and leave only .woff2? caniuse.com gives 94.57% for .woff2 vs 95.5% for .woff.