Get the Prompertize extension

TODO(copy): Get the Prompertize extension page content.

Where to get it

• Chrome Web StoreTODO(store): add listing URL to web/site.config.json
• Microsoft Edge Add-onsTODO(store): add listing URL to web/site.config.json
• Firefox Add-onsTODO(store): add listing URL to web/site.config.json
• Safari (App Store)TODO(store): add listing URL to web/site.config.json