Update make-docs.yml to remove old docs first (#2345)

.github/workflows/make-docs.yml

@@ -79,7 +79,8 @@ jobs:
     - name: Copy artifacts
       run: |
         git pull
-        cp -R /tmp/smithy-docs/* .
+        rm -r 1.0/ 2.0/
+        mv /tmp/smithy-docs/* .
         git config --global user.name "smithy-automation"
         git config --global user.email "[email protected]"
         git add -A