structure.json

{
    "leaf": false,
    "index": { "leaf": true, "id": "index", "title": "GB ASM Programming" },
    "subpages": [
        {
            "leaf": false,
            "index": { "leaf": true, "id": "introduction", "title": "Introduction" },
            "subpages": [
                { "leaf": true, "id": "what_is_gb", "title": "What is Game Boy?" },
                { "leaf": true, "id": "concepts", "title": "Basic concepts" },
                { "leaf": true, "id": "tools", "title": "Tools"}
            ]
        },
        {
            "leaf": false,
            "index": { "leaf": true, "id": "basics", "title": "Basics" },
            "subpages": [
                { "leaf": true, "id": "syntax", "title": "ASM syntax" },
                { "leaf": true, "id": "registers", "title": "Registers" },
                { "leaf": true, "id": "memory", "title": "Memory" },
                { "leaf": true, "id": "flags", "title": "Flags"},
                { "leaf": true, "id": "arithmetics", "title": "Arithmetics & boolean algebra"},
                { "leaf": true, "id": "interlude", "title": "Interlude"},
                { "leaf": true, "id": "jumping", "title": "Jumping around"},
                { "leaf": true, "id": "displaying", "title": "Displaying"},
                { "leaf": true, "id": "hello-world", "title": "Hello World!"}
            ]
        },
        {
            "leaf": false,
            "index": { "leaf": true, "id": "intermediate", "title": "Intermediate" },
            "subpages": [
                { "leaf": true, "id": "memories", "title": "Memory types"},
                { "leaf": true, "id": "stack", "title": "The Stack" },
                { "leaf": true, "id": "calling", "title": "Call me" },
                { "leaf": true, "id": "interrupts", "title": "Interrupts" },
                { "leaf": true, "id": "unfinished", "title": "Not finished..." }
            ]
        },
        {
            "leaf": false,
            "index": { "leaf": true, "id": "extras", "title": "Extras"},
            "subpages": [
                { "leaf": true, "id": "resources", "title": "External resources" },
                {
                    "leaf": false,
                    "index": { "leaf": true, "id": "instructions", "title": "Instruction cheat sheet" },
                    "subpages": [
                        { "leaf": true, "id": "data_manip", "title": "Data manipulation" }
                    ]
                }
            ]
        }
    ],
    "special_pages": [
        { "leaf": true, "id": "404", "title": "Resource not found" }
    ]
}