Add missing configuration fields in book.toml for site URL and edit URL template

Author: Phosphorus-M

book.toml

@@ -1,7 +1,11 @@
 [book]
 authors = ["James Munns"]
+language = "es"
 src = "src"
 title = "El libro de Rust Embebido"
 
 [output.html]
+site-url = "https://embedded-book.rustlang-es.org"
 git-repository-url = "https://github.com/RustLangES/rust-embedded-book"
+git-repository-icon = "fa-github"
+edit-url-template = "https://github.com/RustLangES/rust-embedded-book/edit/main/{path}"