As instruções em Discourse Doc Categories explicam o que é possível atualmente.
Você pode ver um exemplo disso em https://meta.discourse.org/t/using-discourse-index/308031 que contém markdown como o abaixo. Observe que os títulos ## aparecem na barra lateral como seções que podem ser abertas/fechadas. Cada linha * é um item na navegação do menu.
## Uso Geral
* Guia para novos usuários: https://meta.discourse.org/t/discourse-new-user-guide/96331?silent=true
* E-mails de resumo de atividade: https://meta.discourse.org/t/change-frequency-or-unsubscribe-from-activity-summary-emails/239689?silent=true
* Respostas por e-mail de notificação: https://meta.discourse.org/t/configure-whether-previous-replies-are-included-in-your-notification-emails/39834?silent=true
* Convites: https://meta.discourse.org/t/create-and-use-invites/263314?silent=true
* Permissões de nível de confiança: https://meta.discourse.org/t/trust-level-permissions-table-inc-moderator-roles/224824?silent=true
* Curtidas: https://meta.discourse.org/t/what-are-likes/30803?silent=true
* Emblemas padrão: https://meta.discourse.org/t/default-badges-reference-guide/310717?silent=true
* Contadores de cliques em links: https://meta.discourse.org/t/what-are-link-click-counters/254552?silent=true
* Direção mista de texto: https://meta.discourse.org/t/what-does-the-support-mixed-text-direction-setting-do/91247?silent=true
* Sinalização de posts: https://meta.discourse.org/t/what-happens-when-you-flag-a-post/275?silent=true
* Posts de wiki: https://meta.discourse.org/t/what-is-a-wiki-post/30801?silent=true
* Exportar dados do usuário: https://meta.discourse.org/t/export-user-data/313677?silent=true
* Versão do Discourse: https://meta.discourse.org/t/find-what-version-of-discourse-youre-using/104326?silent=true
## Escrita
* Formatação de posts: https://meta.discourse.org/t/supported-formatting-in-posts-markdown-bbcode-and-html/239348?silent=true
* Copiando links: https://meta.discourse.org/t/copy-and-paste-topic-titles-and-other-links-into-posts/106987?silent=true
* Tabelas Markdown: https://meta.discourse.org/t/add-a-table-to-your-post-using-markdown/66544?silent=true
* Criação de enquetes: https://meta.discourse.org/t/create-a-poll-that-others-can-vote-on/77548?silent=true
* Links em destaque: https://meta.discourse.org/t/adding-a-featured-link-to-your-topic/317027
* Pré-visualizações Onebox: https://meta.discourse.org/t/create-rich-link-previews-with-onebox/98088?silent=true
* Vinculando a títulos: https://meta.discourse.org/t/link-to-a-heading-within-a-post-or-topic/47552?silent=true
* Formatação de código: https://meta.discourse.org/t/post-code-or-preformatted-text/188910?silent=true
* Linguagens de bloco de código: https://meta.discourse.org/t/select-the-programming-language-used-in-code-blocks/19247?silent=true
* Modo anônimo: https://meta.discourse.org/t/use-anonymous-mode-to-reply-or-create-topics/240039?silent=true
* Criação de calendários: https://meta.discourse.org/t/create-calendars/283773?silent=true
* Criação de eventos: https://meta.discourse.org/t/create-events/149964?silent=true
* Mensagens pessoais pré-preenchidas: https://meta.discourse.org/t/create-a-link-to-start-a-new-personal-message-with-pre-filled-information/35984?silent=true
* Tópicos pré-preenchidos: https://meta.discourse.org/t/create-a-link-to-start-a-new-topic-with-pre-filled-information/28074?silent=true
## Leitura
* Tópicos sugeridos: https://meta.discourse.org/t/suggested-topic-logic/252936?silent=true
* Estatísticas de tópicos: https://meta.discourse.org/t/topic-views-posts-read-and-reading-time/254542?silent=true
* Rolagem infinita: https://meta.discourse.org/t/what-is-infinite-scrolling/30804?silent=true
* Cancelar inscrição por e-mail: https://meta.discourse.org/t/unsubscribe-from-a-topic-using-email/62748?silent=true
* Feeds RSS: https://meta.discourse.org/t/discourse-rss-feeds-list/264134?silent=true
## Pesquisa e Filtros
* Dicas de pesquisa: https://meta.discourse.org/t/search-tips-and-tricks/273328?silent=true
* Pesquisa por tempo: https://meta.discourse.org/t/search-for-posts-created-within-a-certain-timeframe/41011?silent=true
* Filtros de string de consulta: https://meta.discourse.org/t/use-query-strings-to-filter-topic-views/248224?silent=true
## Interface
* Elementos da interface do usuário: https://meta.discourse.org/t/names-of-user-interface-elements-in-discourse/103351?silent=true
* Menu de notificações: https://meta.discourse.org/t/how-does-the-notifications-menu-work/3059?silent=true
* Recursos da barra lateral: https://meta.discourse.org/t/an-overview-of-sidebar-features/258478?silent=true
* Tópicos principais: https://meta.discourse.org/t/how-are-top-topics-calculated/240928?silent=true
* Sinalização de posts: https://meta.discourse.org/t/flag-a-post-for-moderator-attention/32783?silent=true
* Imprimir em PDF: https://meta.discourse.org/t/print-a-topic-as-a-pdf/160061?silent=true
* Links de preferência: https://meta.discourse.org/t/quick-access-to-discourse-preference-pages-with-easy-relative-links/276375?silent=true
* Cartões de usuário: https://meta.discourse.org/t/quickly-view-a-bit-about-each-other-with-user-cards/44093?silent=true
* Indicadores de aba do navegador: https://meta.discourse.org/t/see-how-many-new-topics-and-posts-are-available-to-read-in-the-browser-tab/33508?silent=true
## Chat
* Recursos de chat: https://meta.discourse.org/t/an-overview-of-features-in-discourse-chat/239695?silent=true