Fix contributors guide page header message using wrong path (#2074)

Author: TrialDragon

templates/macros/base.html

@@ -12,7 +12,7 @@
       Quick Start
     {% elif section_or_page.path is starting_with("/learn/advanced-examples") %}
       Advanced Examples
-    {% elif section_or_page.path is starting_with("/contribute/") %}
+    {% elif section_or_page.path is starting_with("/learn/contribute/") %}
       Contribute
     {% elif section_or_page.path is starting_with("/news/") %}
       News