Plugin does not check supported WP Version

Hi there, your plugin uses functions like register_block_type, but it A) never checks if the functions exist, and B) never checks if the WP version actually supports those functions.

Thus, installing your plugin on a WP Version that does not support Blocks, will fail in a fatal error.

1. It would be super nice if you could just check if those functions exist and if not, exit that code. This would allow you to support a much wider range of WordPress installs. Due to the current setup of the plugin, you can only support Block version of WP
2. If you are not willing to support older versions of WordPress or the up and coming ClassicPress, it would be a must to check if the current WordPress version is actually the one you expect. This will at least avoid fatal errors.

I am available to help with this, if you are willing to support older versions of WordPress and/or ClassicPress as well.

Thank you!