Update book.toml to link to the GitHub repo

Tomer-Eliahu · adamgreig · commit 256e2d4ece5a · 2025-05-20T19:41:37.000+01:00
Add an icon to the resulting book that links to the repo.
diff --git a/book.toml b/book.toml
@@ -3,3 +3,6 @@ authors = ["Jorge Aparicio"]
 multilingual = false
 src = "src"
 title = "The Embedonomicon"
+
+[output.html]
+git-repository-url = "https://github.com/rust-embedded/embedonomicon"
