Description of extended deck missing from README

[dusky-seaside-sparrow]

As a new ultimate-geography user, I had been wondering what the 'extended deck' was. I only found after Googling, that it is 'a version of the deck with two additional note templates'.

This was not obvious to me at first, and I couldn't find the info in the README or in the AnkiWeb description, even though the extended version is mentioned there. So it might make sense to add a short description in the README and AnkiWeb description.

[axelboc]

It's mentioned right at the start of the README, under Features! But if you missed it then perhaps it should be more explicit. Anything in mind?

[dusky-seaside-sparrow]

Wow, I have no idea how I could have missed this. 🙃 My apologies.

The only suggestion I would have is to include this in the AnkiWeb explanation, so people don't have to go to the GitHub README to find it.