DOC: Move to 'furo' theme

Also adds the copybutton extensions. This theme is more modern and
provdes better in-page navigation.

docs/src/conf.py

@@ -44,6 +44,7 @@ def filter(self, record: logging.LogRecord) -> bool:
     "sphinx_togglebutton",
     "sphinxcontrib.apidoc",
     "sphinxcontrib.autodoc_pydantic",
+    "sphinx_copybutton",
 ]
 
 myst_enable_extensions = [
@@ -120,16 +121,8 @@ def set_myst_substitutions() -> dict[str, str]:
 
 pygments_style = "sphinx"
 
-html_theme = "sphinx_rtd_theme"
-html_theme_options = {
-    "style_nav_header_background": "#C0C0C0",
-    "navigation_depth": -1,
-    "collapse_navigation": False,
-    "titles_only": True,
-}
-
-
-# html_logo = "images/xtgeo-logo.png"
+html_theme = "furo"
+# html_logo = "images/logo.png"
 
 # The name of an image file (within the static path) to use as favicon
 # of the docs.  This file should be a Windows icon file (.ico) being

docs/src/products/initial_inplace_volumes.md

@@ -4,11 +4,6 @@ This exports the initial inplace volumes of a single grid from within RMS.
 
 - Current schema version: **{{ InplaceVolumesSchema_VERSION }}**
 
-```{contents}  Contents
-:local:
-:depth: 2
-```
-
 ## Requirements
 
 - RMS

pyproject.toml

@@ -67,14 +67,15 @@ dev = [
     "types-PyYAML",
 ]
 docs = [
+    "Sphinx",
     "autoapi",
     "autodoc-pydantic>=2.0.0",
+    "furo",
     "myst-parser",
     "pydocstyle",
     "sphinx-autodoc-typehints<1.23",
-    "sphinx-rtd-theme",
+    "sphinx-copybutton",
     "sphinx-togglebutton",
-    "Sphinx",
     "sphinxcontrib-apidoc",
     "urllib3<1.27",
 ]