Update Docs CI with mdbook translation support (#516)

* Update Docs CI with mdbook translation support #514

* install mdbook with --rev

docs/guide/src/en/__unused/event_javascript.rs

@@ -4,7 +4,7 @@
 Instead of passing a closure, you can also pass a string to event handlers – this lets you use JavaScript (if your renderer can execute JavaScript):
 
 ```rust
-{{#include ../../examples/event_javascript.rs:rsx}}
+{{#include ../../../examples/event_javascript.rs:rsx}}
 ```