Fix docs.yml workflow: remove conflicting native build step (#8091)

* Initial plan

* Fix docs.yml workflow to properly build and deploy documentation

- Remove `no-install: true` from setup-emsdk step to properly install emscripten
- Remove `working-directory: src/api/js` from setup-emsdk step (not needed)
- Remove manual emsdk install/activate/source commands from Build wasm step
- Remove redundant native Z3 build step that conflicted with wasm build
- Simplify Generate Documentation step by removing redundant source command

The main issue was that the native Z3 build was creating a Makefile in the build/
directory before the wasm build ran. The wasm build script then saw the Makefile
existed and skipped the emconfigure step, but the native Makefile doesn't have a
libz3.a target, causing the build to fail. Removing the native build allows the
wasm build to properly configure its own build with emscripten.

Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>

.github/workflows/docs.yml

@@ -37,9 +37,7 @@ jobs:
 
       - name: Setup emscripten
         uses: mymindstorm/setup-emsdk@v14
-        working-directory: src/api/js
         with:
-          no-install: true
           version: ${{env.EM_VERSION}}
           actions-cache-folder: "emsdk-cache"
 
@@ -53,25 +51,11 @@ jobs:
 
       - name: Build wasm
         working-directory: src/api/js
-        run: |
+        run: npm run build:wasm
-          emsdk install ${EM_VERSION}
-          emsdk activate ${EM_VERSION}
-          source $(dirname $(which emsdk))/emsdk_env.sh
-          which node
-          which clang++
-          npm run build:wasm
-
-      - name: Build Z3 for ubuntu-latest x64
-        run: |
-          python3 scripts/mk_make.py
-          cd build
-          make -j$(nproc)
 
       - name: Generate Documentation (from doc directory)
         working-directory: doc
-        run: |
+        run: python3 mk_api_doc.py --js --output-dir=api
-          source $(dirname $(which emsdk))/emsdk_env.sh
-          python3 mk_api_doc.py --js --output-dir=api
 
       - name: Setup Pages
         uses: actions/configure-pages@v5