Ideally category and search are fully optional, however some sites break if one or the other is not provided.
Unfortuntely `boards.ie` has a different page type for searches and I'm not bothered to implement a scraper from scratch.
In addition, removed comment limit options.
Idea is to have a "plugin-type" system, where new connectors can extend the `BaseConnector` class and implement the fetch posts method.
These are automatically detected by the registry, and automatically used in new Flask endpoints that give a list of possible sources.
Allows for an open-ended system where new data scrapers / API consumers can be added dynamically.
