fix windows path separators

Author: rumpelst1lzk1n

book.toml

@@ -11,11 +11,11 @@ optional = true
 
 [output.html]
 git-repository-url = "https://github.com/rumpelst1lzk1n/rumpelst1lzk1n.github.io"
-additional-css = ["src\\custom.css", "src\\lightbox\\css\\lightbox.min.css"]
+additional-css = ["src/custom.css", "src/lightbox/css/lightbox.min.css"]
 additional-js = [
-  "src\\lightbox\\js\\lightbox-plus-jquery.min.js",
-  "src\\lightbox\\js\\lightbox.min.js",
-  "src\\lightbox\\lightbox.init.js",
+  "src/lightbox/js/lightbox-plus-jquery.min.js",
+  "src/lightbox/js/lightbox.min.js",
+  "src/lightbox/lightbox.init.js",
 ]
 
 [preprocessor.links]