bump mdBook to v0.5.2

Handbook/book.toml

@@ -28,7 +28,6 @@
 authors = ["Mamadou Babaei"]
 description = "Welcome to the SenseGlove Unreal Engine documentation!"
 language = "en"
-multilingual = false
 src = "src"
 text-direction = "ltr"
 title = "The SenseGlove Unreal Engine Handbook"
@@ -43,8 +42,6 @@ use-default-preprocessors = true
 
 [preprocessor.links]
 
-[preprocessor.alerts]
-
 [preprocessor.senseglove]
 after = [ "index", "links" ]
 command = "sh ./bin/sg-preprocessor.sh"
@@ -59,10 +56,9 @@ footnote-backrefs = true
 additional-css = ["styles/custom.css"]
 additional-js = []
 cname = "unreal.docs.senseglove.com"
-copy-fonts = true
 default-theme = "navy"
 git-repository-url = "https://dev.azure.com/SenseGlove/_git/SenseGlove-Unreal"
-git-repository-icon = "fa-git"
+git-repository-icon = "fab-git"
 input-404 = "404.md"
 mathjax-support = false
 no-section-label = false