Correct site_url, theme language key, navigation.footer flag, and remove invalid color_mode settings (#4)

Author: iantsednv

mkdocs.yml

@@ -1,7 +1,7 @@
 site_name: SolarFarmer Python SDK
 site_description: Official Python SDK for DNV SolarFarmer. Build PV plant configurations and run energy calculations.
 site_author: DNV
-#site_url: https://github.com/dnv-opensource/solarfarmer-python-sdk
+site_url: https://dnv-opensource.github.io/solarfarmer-python-sdk/
 copyright: '© 2026 DNV AS. All rights reserved.'
 repo_url: https://github.com/dnv-opensource/solarfarmer-python-sdk
 docs_dir: docs
@@ -22,7 +22,7 @@ extra:
 
 theme:
   name: material
-  locale: en
+  language: en
   logo: 'img/SolarFarmerLogo.png'
   palette:
     - scheme: default
@@ -41,14 +41,12 @@ theme:
   features:
     - navigation.instant
     - navigation.tracking
-    - navigation.footer.prev_next
+    - navigation.footer
     - content.code.copy
     - content.code.annotate
     - search.suggest
     - search.highlight
     - content.tabs.link
-  color_mode: auto
-  user_color_mode_toggle: true
 
 markdown_extensions:
   - admonition