Move the changelog to the cargo book (#15119)

This moves cargo's changelog to the cargo book. We're bumping into
rendering limits on GitHub's side, so we're moving the changelog to the
cargo book where it can be statically served under our control.

This PR is structured in such a way that the original CHANGELOG.md file
is kept in place (and history is preserved in the new copy). The intent
is to wait until this PR makes it to the nightly channel, and then open
a new PR that will delete the original. That will look something like
ehuss@5ce7947.

This makes use of a new mdbook feature in order to exclude the changelog
chapter from the search index. It completely swamps the search results,
so I think it is best to just exclude it.

We'll need to coordinate with the release team so that future release
notes link directly to the cargo book instead of GitHub.

.github/workflows/contrib.yml

@@ -23,7 +23,7 @@ jobs:
     - name: Install mdbook
       run: |
         mkdir mdbook
-        curl -Lf https://github.com/rust-lang/mdBook/releases/download/v0.4.40/mdbook-v0.4.40-x86_64-unknown-linux-gnu.tar.gz | tar -xz --directory=./mdbook
+        curl -Lf https://github.com/rust-lang/mdBook/releases/download/v0.4.44/mdbook-v0.4.44-x86_64-unknown-linux-gnu.tar.gz | tar -xz --directory=./mdbook
         echo `pwd`/mdbook >> $GITHUB_PATH
     - name: Deploy docs
       run: |

.github/workflows/main.yml

@@ -261,7 +261,7 @@ jobs:
     - name: Install mdbook
       run: |
         mkdir mdbook
-        curl -Lf https://github.com/rust-lang/mdBook/releases/download/v0.4.40/mdbook-v0.4.40-x86_64-unknown-linux-gnu.tar.gz | tar -xz --directory=./mdbook
+        curl -Lf https://github.com/rust-lang/mdBook/releases/download/v0.4.44/mdbook-v0.4.44-x86_64-unknown-linux-gnu.tar.gz | tar -xz --directory=./mdbook
         echo `pwd`/mdbook >> $GITHUB_PATH
     - run: cd src/doc && mdbook build --dest-dir ../../target/doc
     - name: Run linkchecker.sh

src/doc/book.toml

@@ -6,7 +6,12 @@ author = "Alex Crichton, Steve Klabnik and Carol Nichols, with contributions fro
 smart-punctuation = true # Enable smart-punctuation feature for more than quotes.
 git-repository-url = "https://github.com/rust-lang/cargo/tree/master/src/doc/src"
 edit-url-template = "https://github.com/rust-lang/cargo/edit/master/src/doc/{path}"
-search.use-boolean-and = true
+
+[output.html.search]
+use-boolean-and = true
+
+[output.html.search.chapter]
+"CHANGELOG.md" = { enable = false }
 
 [output.html.redirect]
 "/guide/build-cache.html" = "../reference/build-cache.html"

src/doc/contrib/src/process/release.md

@@ -183,7 +183,7 @@ The process here is similar to the beta-backporting process. The
 [choochoo]: https://doc.rust-lang.org/book/appendix-07-nightly-rust.html
 [rust-lang/rust]: https://github.com/rust-lang/rust/
 [rust-lang/cargo]: https://github.com/rust-lang/cargo/
-[CHANGELOG]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md
+[CHANGELOG]: https://github.com/rust-lang/cargo/blob/master/src/doc/src/CHANGELOG.md
 [release process]: https://forge.rust-lang.org/release/process.html
 [`TargetInfo`]: https://github.com/rust-lang/cargo/blob/master/src/cargo/core/compiler/build_context/target_info.rs
 [crates.io]: https://crates.io/

src/doc/contrib/src/process/security.md

@@ -131,6 +131,6 @@ Post release:
 [GHSA-r5w3-xm58-jv6j]: https://github.com/rust-lang/cargo/security/advisories/GHSA-r5w3-xm58-jv6j
 [handling reports]: https://github.com/rust-lang/wg-security-response/blob/main/docs/handling-reports.md
 [first-guide]: https://www.first.org/cvss/user-guide
-[`CHANGELOG.md`]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md
+[`CHANGELOG.md`]: https://github.com/rust-lang/cargo/blob/master/src/doc/src/CHANGELOG.md
 [`Cargo.toml`]: https://github.com/rust-lang/cargo/blob/master/Cargo.toml
 [`RELEASES.md`]: https://github.com/rust-lang/rust/blob/master/RELEASES.md

src/doc/src/SUMMARY.md

@@ -97,5 +97,6 @@
     * [Deprecated and Removed](commands/deprecated-and-removed.md)
 
 * [FAQ](faq.md)
+* [Changelog](CHANGELOG.md)
 * [Appendix: Glossary](appendix/glossary.md)
 * [Appendix: Git Authentication](appendix/git-authentication.md)

src/doc/src/index.md

@@ -34,7 +34,7 @@ The commands will let you interact with Cargo using its command-line interface.
 * [Git Authentication](appendix/git-authentication.md)
 
 **Other Documentation:**
-* [Changelog](https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md)
+* [Changelog](CHANGELOG.md)
   --- Detailed notes about changes in Cargo in each release.
 * [Rust documentation website](https://doc.rust-lang.org/) --- Links to official
   Rust documentation and tools.