chore: fix "docs ghpages/deploy" ci (#305)

* ci: update toolchain for docs/ghpages ci

* refactor: move the "katex-header.html" file for docs/ghpages ci

* chore: add the html copy/delete process in ci

.github/katex-header.html

@@ -12,4 +12,4 @@
             ]
         });
     });
-</script>
+</script>

.github/workflows/docs-ghpages.yml

@@ -16,9 +16,17 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions-rs/toolchain@v1
         with:
-          toolchain: nightly
+          toolchain: nightly-2023-10-05
           override: true
 
+      - name: Copy the html file to workspace crates
+        run: |
+          for cargo_toml in $(find . -name Cargo.toml); do
+            crate_dir=$(dirname $cargo_toml)
+            cp .github/katex-header.html $crate_dir
+            echo "Copied html file to $crate_dir"
+          done
+
       - name: Build latest rustdocs
         uses: actions-rs/cargo@v1
         with:
@@ -33,6 +41,14 @@ jobs:
           cp -R ./target/doc ./docs
           echo "<meta http-equiv=\"refresh\" content=\"0; url=halo2_proofs\">" > ./docs/index.html
 
+      - name: Delete the html files copied to every crate
+        run: |
+          for cargo_toml in $(find . -name Cargo.toml); do
+            crate_dir=$(dirname $cargo_toml)
+            rm -f $crate_dir/katex-header.html
+            echo "Deleted html file in $crate_dir"
+          done
+
       - name: Deploy to GitHub Pages
         uses: peaceiris/actions-gh-pages@v3
         with:

halo2_frontend/src/lib.rs

@@ -1,3 +1,5 @@
+#![cfg_attr(docsrs, feature(doc_cfg))]
+
 pub mod circuit;
 pub mod dev;
 pub mod plonk;