Behaviour for dynamically providing llms.txt sections.

Implement sections/0 to return a list of sections, where each section is a tuple of {section_name, entries}.

Each entry is one of:

• {name, url} — a link
• {name, url, description} — a link with a description
• {name, entries} — a sub-section (rendered as H3) containing its own entries
• "string" — inline markdown content rendered as-is

A section named "Optional" signals to LLMs that its content can be skipped when context is limited.

Example

defmodule MyAppWeb.LLMsProvider do
  @behaviour SEO.LLMs.Provider

  @impl true
  def sections do
    [
      {"Docs", [
        {"API Reference", "/docs/api.md", "Full REST API docs"},
        {"Guides", "/docs/guides.md"}
      ]},
      {"SDKs", [
        {"TypeScript", [
          {"Client SDK", "/sdk/ts", "TypeScript client"},
          {"Server SDK", "/sdk/ts-server"}
        ]},
        {"Python", [
          {"Client SDK", "/sdk/py"}
        ]}
      ]},
      {"Optional", [
        {"Changelog", "/changelog.md"}
      ]}
    ]
  end
end