Cleanup books. Add Fantasy::Tolkien to README.

[mathisto]

Issue#

No-Story

Description:

This PR:

1. Reformats the YAML for the books generators.
2. Adds the Fantasy::Tolkien generator to the README.
3. And adds docs entry to Fantasy::Tolkien

[vbrazo]

What does Fantasy do and why do we need a new namespace?

[Zeragamba]

Came in with the new Faker::Fantasy::Tolkien. Since LotR and the Hobbit are equally popular as both movies and books, it didn't really make sense for that stuff to be in either. Since Tolkien is often attributed to being the grandfather of the modern fantasy world, I thought it was fitting to create a new namespace for it there.

We can alias some of the other fantasy stuff into Fantasy later.

[mathisto]

Fantasy was the new namespace I was asked to add in PR #2152 to consolidate and normalize the existing Tolkien generators (Movies::Hobbit and Movies::LordOfTheRings). The quotes section in these 'movie' generators betray their origin as books.

[Zeragamba]

Looks good to me. I'll wait for @vbrazo to approve as well.

[mathisto]

If it's not too much trouble, I'd like to request this PR receive the hacktoberfest-accepted tag. 🙇