Learning Curriculum: A Fronttiy Project

[juanmaguitar]

[juanmaguitar]

We should include here, in the Settings section what @michalczaplinski commented in https://github.com/frontity/api-reference/pull/4#issuecomment-784666309

I did not see any place in the api-reference where you specify that state.frontity.url has to be set to a particular valve. I think previously it was not strictly necessary, but now we absolutely require it to be set by the user in order for a Frontity site to run. I think that you should add such a section to the docs.