DOC: don't use shields IO for CI badges.
DOC: don't use shields IO for CI badges.

For some reason, shields.io badges load really slow here.

himikof/intellij-rust,anton-okolelov/intellij-rust,intellij-rust/intellij-rust,anton-okolelov/intellij-rust,intellij-rust/intellij-rust,himikof/intellij-rust,himikof/intellij-rust,Undin/intellij-rust,Undin/intellij-rust,intellij-rust/intellij-rust,Undin/intellij-rust,himikof/intellij-rust,Undin/intellij-rust,alygin/intellij-rust,anton-okolelov/intellij-rust,anton-okolelov/intellij-rust,d9n/intellij-rust,Undin/intellij-rust,d9n/intellij-rust,intellij-rust/intellij-rust,alygin/intellij-rust,alygin/intellij-rust,d9n/intellij-rust,d9n/intellij-rust,himikof/intellij-rust,alygin/intellij-rust,alygin/intellij-rust,d9n/intellij-rust,Undin/intellij-rust,intellij-rust/intellij-rust,anton-okolelov/intellij-rust,intellij-rust/intellij-rust