Delete old documentation

### Describe the issue linked to the documentation

When googling for tutorials, it is possible to get search results from outdated documentation that can confuse users.

For example, googling "AutoGluon text" can return this result from an outdated version that won't work:
https://auto.gluon.ai/scoredebugweight/tutorials/text_prediction/beginner.html

### Suggest a potential alternative/fix

We should delete these old doc pages to avoid this.

Start by inspecting the outdated page at the linked AutoGluon URL and locate its source in the documentation tree. Identify the other old pages intended for removal, delete them from the published documentation, and run the available documentation build or link checks to confirm they are no longer included.

Written by the indexing model from the issue text.