Update to mdbook 0.5

Changelog: https://github.com/rust-lang/mdBook/blob/master/CHANGELOG.md#mdbook-051

Author: ehuss

.github/workflows/docs.yml

@@ -13,7 +13,7 @@ jobs:
       contents: write  # for Git to git push
     runs-on: ubuntu-latest
     env:
-      MDBOOK_VERSION: 0.4.51
+      MDBOOK_VERSION: 0.5.1
     steps:
     - uses: actions/checkout@v5
       with:

guide/book.toml

@@ -1,10 +1,7 @@
 [book]
 language = "en"
-multilingual = false
-src = "src"
 title = "cargo-bisect-rustc"
 
 [output.html]
-curly-quotes = true
 git-repository-url = "https://github.com/rust-lang/cargo-bisect-rustc/tree/master/guide/src"
 edit-url-template = "https://github.com/rust-lang/cargo-bisect-rustc/edit/master/guide/{path}"