Fix katex-header path in CI

Author: termoshtt

.github/workflows/gh-pages.yml

@@ -12,7 +12,7 @@ jobs:
       - uses: actions/checkout@v2
       - name: Generate code coverage
         run: |
-          RUSTDOCFLAGS="--html-in-header katex-header.html" cargo doc --no-deps
+          RUSTDOCFLAGS="--html-in-header ndarray-linalg/katex-header.html" cargo doc --no-deps
           mv target/doc public
       - name: Deploy GitHub Pages
         uses: peaceiris/actions-gh-pages@v3