Just responded to your comment in my Excel blog post :). Definitely message us (big question mark in the bottom right of a Coda doc) if you have any questions as you build out your docs. I’ll try to answer your questions myself!
Regarding pulling data from regular websites, the short answer is yes, but it requires the use of Coda’s API: https://coda.io/api. The Packs feature are custom integrations we built to pull (and push) data to/from Gmail, Slack, Google Calendar, etc. If the website you are trying to pull data from has an API, you can pull data in using Coda’s API, but it definitely requires a bit of development work.