Guides, reimagined: categories, search, and improved navigation

The number of different guides and documentation materials grew over the years, to the point where it became harder to find information unless you knew what you were looking for, or relied solely on the search functionality. To address this, we have decided to reorganise the guides by categories rather than keeping them grouped by types (guide, tutorial, etc.). In addition, we wanted to make it easier to navigate between the guides once you have already opened a specific page.