header links

[pdurbin]

The header links are a bit hard to control. Here's how they looks now, as of eb28186, on https://sphinx.dataverse.org

The reason you see these links...

• Researchers
• Journals
• Institutions
• Developers

... is explained this way:

"The header navigation bar is at the top of each page and contains top-level navigation across pages in your documentation, as well as extra links and components that you can add." -- https://pydata-sphinx-theme.readthedocs.io/en/stable/user_guide/header-links.html

The top level navigation is coming from here in source/index.md:

```{toctree}
:hidden:
about/index
community/index
best-practices/index
software/index
contact/index
researchers/index
journals/index
institutions/index
developers/index

Plus I added the "Working Groups" link like this in source/config.py:

html_theme_options = {
  "show_prev_next": False,
  "header_links_before_dropdown": 5,
  # see https://pydata-sphinx-theme.readthedocs.io/en/stable/user_guide/source-buttons.html
  "use_edit_page_button": True,
  "external_links": [
      {"name": "Working Groups", "url": "https://www.gdcc.io/working-groups.html"}
  ]
}

In the old site the heading links are fairly divorced from the the hierarchy of pages: