Use explicit conditional checks and update documentation URLs

Co-authored-by: djeada <[email protected]>

.github/workflows/windows.yml

@@ -124,7 +124,7 @@ jobs:
 
       # Code signing (optional: signs .exe with Authenticode)
       - name: Sign executable
-        if: ${{ secrets.WINDOWS_CERTIFICATE && secrets.WINDOWS_CERTIFICATE_PASSWORD }}
+        if: ${{ secrets.WINDOWS_CERTIFICATE != '' && secrets.WINDOWS_CERTIFICATE_PASSWORD != '' }}
         shell: pwsh
         env:
           CERT_DATA: ${{ secrets.WINDOWS_CERTIFICATE }}

docs/WINDOWS_CODE_SIGNING.md

@@ -145,6 +145,6 @@ Potential improvements for the code signing implementation:
 
 ## References
 
-- [Microsoft SignTool Documentation](https://docs.microsoft.com/en-us/windows/win32/seccrypto/signtool)
-- [Windows Authenticode Documentation](https://docs.microsoft.com/en-us/windows-hardware/drivers/install/authenticode)
+- [Microsoft SignTool Documentation](https://learn.microsoft.com/en-us/windows/win32/seccrypto/signtool)
+- [Windows Authenticode Documentation](https://learn.microsoft.com/en-us/windows-hardware/drivers/install/authenticode)
 - [GitHub Actions Encrypted Secrets](https://docs.github.com/en/actions/security-guides/encrypted-secrets)