docs: fix need to double-click navigation

docs/javascripts/nav-workaround.js

@@ -0,0 +1,10 @@
+// workaround issue (or similar) https://github.com/squidfunk/mkdocs-material/issues/6726
+document.addEventListener('DOMContentLoaded', function() {
+  // Select all input elements with both 'md-nav__toggle' and 'md-toggle--indeterminate' classes
+  const elements = document.querySelectorAll('input.md-nav__toggle.md-toggle--indeterminate');
+
+  // Loop through each element and remove the 'md-toggle--indeterminate' class
+  elements.forEach(function(element) {
+      element.classList.remove('md-toggle--indeterminate');
+  });
+});

mkdocs.yml

@@ -133,6 +133,7 @@ markdown_extensions:
         emoji_generator: !!python/name:material.extensions.emoji.to_svg
 
 extra_javascript:
+  - javascripts/nav-workaround.js
   - javascripts/config.js 
   - https://polyfill.io/v3/polyfill.min.js?features=es6
   - https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-chtml.js