Summary

I've updated the upsell links and buttons as per the Google Doc: https://docs.google.com/document/d/1EeYt1wUqzEq12Xcp8C5bN-XMl66a-8B7U3Mmz_sd3Vs/edit?usp=sharing

For more details please check here https://github.com/Codeinwp/visualizer-pro/issues/475

Check before Pull Request is ready:

• I have written a test and included it in this PR
• I have run all tests and they pass
• The code passes when running the PHP CodeSniffer
• Code meets WordPress Coding Standards for PHP, HTML, CSS and JS
• Security and Sanitization requirements have been followed
• I have assigned a reviewer or two to review this PR (if you're not sure who to assign, we can do this step for you)

Closes https://github.com/Codeinwp/visualizer-pro/issues/475