Revert "Fix codespell, try different argument --regex (#1669)" (#1671)

This reverts commit 99a0c46.

Author: jackiekazil

.github/workflows/codespell.yml

@@ -15,5 +15,4 @@ jobs:
     - uses: codespell-project/actions-codespell@master
       with:
         ignore_words_file: .codespellignore
-        skip: .*bootstrap.*,*.js,.*bootstrap-theme.css.map
-        IGNORE_REGEX: ^\s*"image\/png":\s.*
+        skip: .*bootstrap.*,*.js,.*bootstrap-theme.css.map,./docs/*.ipynb