Fix newsletter anchor link in resources dropdown (#1483)

Update newsletter URL from https://reflex.dev/#newsletter to https://reflex.dev/open-source/#newsletter in the resources dropdown navigation.

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Co-authored-by: [email protected] <[email protected]>
Co-authored-by: Ahmad Hakim <[email protected]>

Author: devin-ai-integration[bot]

pcweb/components/docpage/navbar/navbar.py

@@ -270,7 +270,7 @@ def new_resource_section():
     _company_items = [
         {
             "label": "Newsletter",
-            "url": "https://reflex.dev/#newsletter",
+            "url": "https://reflex.dev/open-source/#newsletter",
             "icon": "mails",
         },
         {"label": "Blog", "url": "/blog", "icon": "library-big"},