Revert 2019 changes for apps

[benjk]

In Decemeber 2019 Shopify released an update that has now disabled developers being able to install apps using the installation link and the apps need to be approved by Shopify before doing so. These changes have caused me limitations and I am aware others are also feeling the same way. Please can you revert the change and allow us to install apps the way we could before the update in 2019.