Remove "Use PyMeilisearch as a documentation search engine" topic

[PipKat]

Description of the modifications

Now that we have moved away from using PyMeilisearch as a documentation search engine, the "Use PyMeilisearch as a documentation search engine" topic should either be removed (or repurposed if we need to describe how to set up the replacement search engine).

Useful links and references

https://dev.docs.pyansys.com/how-to/documenting.html#use-pymeilisearch-as-a-documentation-search-engine