Add a way to see all the algorithms in a grouped manner.

In the documentation, we should have a group for algorithms (or something like that) to allow one to just see a list of the algorithms, without having to search through all the concepts.

Start by reviewing the documentation structure and how algorithms are currently presented. Define a grouped algorithms section or index that lets readers see the algorithm list without searching through all concepts; done means the documentation provides that direct list.

Written by the indexing model from the issue text.