Remove deprecated and now removed mdbook config (#430)

rnestler · web-flow · commit 86da13d5d3c7 · 2025-12-05T15:53:47.000+01:00
Apparently it was never used and got recently removed. See rust-lang/mdBook#2636
diff --git a/book.toml b/book.toml
@@ -1,7 +1,6 @@
 [book]
 authors = ["devs@Renuo"]
 language = "en"
-multilingual = false
 src = ""
 title = "Renuo - Application Setup Guide"
 
