feature-request: Render page titles when using page references

[davesnx]

Currently referencing a page is done via {{!page-"name_of_the_mld_file"}Some random text}, would be nice to render the title of that name_of_the_mld_file.mld when no text is being added as reference.

It currently works like this on the sidebar, where the title ({0 }) of the page gets rendered on the sidebar.

Example

{ol
  {li {{!page-"get-started"}}}
  {li {{!page-"basic-usage"}}}
  {li {{!page-"universal-code"}}}
  {li {{!page-"how-to-organise-universal-code"}}}
  {li {{!page-"browser_ppx"}}}
  {li {{!page-"externals-melange-attributes"}}}
}

should be equivalent of (assuming that those texts are the titles of the pages)

{ol
  {li {{!page-"get-started"}Get started}}
  {li {{!page-"basic-usage"}Basic usage}}
  {li {{!page-"universal-code"}What does universal code mean?}}
  {li {{!page-"how-to-organise-universal-code"}How to organise universal code}}
  {li {{!page-"browser_ppx"}Exclude client code from the native build}}
  {li {{!page-"externals-melange-attributes"}Externals and melange attributes}}
}