Add rust doc output to pages (#58)

First attempt at adding rustdoc to github pages. This is a step towards #46

.github/workflows/ibis_pages.yml

@@ -31,6 +31,10 @@ jobs:
         version: 'latest'
     - name: Build using wasm-pack
       run: wasm-pack build --target web --locked --release --verbose
+    - name: Build docs using cargo doc
+      run: cargo doc
+    - Move docs to docs folder
+      run: mv ./target/docs/* ./docs/
     - uses: actions/upload-artifact@v2
       with:
         if-no-files-found: error