Create a general overview page for Prolog Predicates documentation

[coderabbitai]

As discussed in PR #598, the Prolog Predicates section in the API Reference currently links to a specific predicate (/predicates/bank_balances_2). It would be beneficial to have a general predicates overview page similar to the ontology section. This issue is to track the creation of such an overview page.

Referenced by PR #598 and comment by @ccamel.