[Doc] Update to pydata-sphinx-theme 0.14 and fix some styling issues

.github/workflows/main.yml

@@ -325,7 +325,7 @@ jobs:
         run: |
           python3 -m pip install ruamel.yaml scons numpy cython 'sphinx>=5.3.0' \
             sphinxcontrib-matlabdomain sphinxcontrib-doxylink sphinxcontrib-bibtex \
-            pydata-sphinx-theme==0.13.3 sphinx-argparse sphinx_design myst-nb \
+            pydata-sphinx-theme==0.14.1 sphinx-argparse sphinx_design myst-nb \
             matplotlib pandas scipy pint
           python3 -m pip install "git+https://github.com/sphinx-gallery/sphinx-gallery.git@master"
           python3 -m pip install "git+https://github.com/Cantera/sphinx-tags.git@main"

doc/doxygen/cantera-doxygen.css

@@ -1,11 +1,11 @@
 /* Colors to match pydata-sphinx-theme */
 html {
-    --primary-color: rgb(69, 157, 185);
+    --primary-color: rgb(10, 125, 145);
     --pst-color-text-muted: rgb(100, 100, 100);
 }
 
 html.dark-mode {
-    --primary-color: rgb(69, 157, 185);
+    --primary-color: rgb(63, 177, 197);
     --pst-color-text-muted: rgb(164, 164, 164);
 }
 

doc/sphinx/_static/custom.css

@@ -8,3 +8,8 @@ p + div.math {
     display: none;
     visibility: hidden;
 }
+
+.bd-header .navbar-header-items__center {
+    /* Reduce gap between Sphinx sections and ones added via cantera-org-links.html */
+    column-gap: normal;
+}

doc/sphinx/_templates/numfocus.html

@@ -1,4 +1,6 @@
 <div id="numfocus">
-<a href="https://numfocus.salsalabs.org/donate-to-cantera/index.html" class="btn btn-secondary" type="button">Donate to Cantera</a>
+<a href="https://numfocus.salsalabs.org/donate-to-cantera/index.html"
+   class="sd-sphinx-override sd-btn sd-text-wrap sd-btn-secondary reference external"
+   type="button">Donate to Cantera</a>
 <a href="https://numfocus.org/"><img src="{{pathto("_static/images/powered_by_NumFOCUS.svg", 1) }}" border="0" alt="NumFOCUS"/></a>
 </div>

doc/sphinx/conf.py

@@ -311,6 +311,7 @@ html_theme = 'pydata_sphinx_theme'
 html_theme_options = {
     "show_toc_level": 2,
     "navbar_center": ["navbar-nav", "cantera-org-links"],
+    "navbar_align": "left",
     "navbar_end": ["version-switcher", "theme-switcher", "navbar-icon-links"],
     "show_prev_next": False,
     "logo": {