How to manage categories in 7.0 York template?

It just happens I was recently messing with this too.

In the York template, each project is itself a collection. When you upload images etc to your project, you have the option to add categories to each item within your project collection. Once they are added to the items, they can be managed at the collection/project level. 

To manage Categories you already have on your Alto Farms project:

1. Navigate to pages
2. Choose settings on your Alto Farms project
3. Choose Advanced
4. Then Manage Categories

You can remove categories here.

If you need to add a new category:

1. Navigate to pages
2. Navigate in to your project
3. Choose settings for an item in your "Alto Farms" project collection (an image, for example)
4. In the content section, scroll down to categories, select it
5. Add a category