revert O0 in docs build (#902)

Author: jishnub

.github/workflows/docs.yml

@@ -34,7 +34,7 @@ jobs:
             ${{ runner.os }}-test-
             ${{ runner.os }}-
       - name: Install dependencies
-        run: julia -O0 --project=docs/ -e 'using Pkg; Pkg.develop(PackageSpec(path=pwd())); Pkg.instantiate()'
+        run: julia --project=docs/ -e 'using Pkg; Pkg.develop(PackageSpec(path=pwd())); Pkg.instantiate()'
       - name: Build and deploy
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}