[DOC] `CharacterNormalizer` page is not found (404)

## Report needed documentation

**Location of incorrect documentation**
* https://docs.nvidia.com/cudf/latest/cudf/api_docs/character_normalizer/index.html
* https://docs.rapids.ai/api/cudf/stable/user_guide/api_docs/character_normalizer/

**Describe the problems or issues found in the documentation**
Both lead me to 404.

**Steps taken to verify documentation is incorrect**
Top two results on DuckDuckGo lead to 404:

**Suggested fix for documentation**
Redirect to wherever the new place.

Start with the two reported CharacterNormalizer documentation URLs and inspect the cuDF documentation structure for the current page location. Add redirects from both old paths to the current page, then verify that the links no longer return 404 and reach the CharacterNormalizer documentation.

Written by the indexing model from the issue text.