[docs] Gitbook link and article on cucumber-rails

[olleolleolle]

Summary

This PR adds a cucumber-rails article to the Gitbook.

Details

Adding an article on cucumber-rails, I created a directory docs/extensions/ for it.

Motivation and Context

How Has This Been Tested?

I ran the gitbook serve on my machine and how pretty it was.

Checklist:

• I've added tests for my code.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[mattwynne]

ping @plaindocs we should migrate this over to https://github.com/cucumber/docs.cucumber.io

[olleolleolle]

@mattwynne Would it be best to hold off completely with adding/changing this repo's documentation until the docs.cucumber.io is up and running?

[plaindocs]

@olleolleolle probably - although we might be in a position to accept PRs sooner than we're ready to put it live.

[olleolleolle]

@plaindocs Asking differently: Since the content has yet to be migrated to the https://github.com/cucumber/docs.cucumber.io repo, should I merge this PR to the monorepo first?

[plaindocs]

Hi @olleolleolle - most of the content from this repo is in https://github.com/cucumber/docs.cucumber.io in the sw-reorg branch. Best thing would be to make a PR against that?

As soon as we push that live (SOON I hope) I'll look at any outstanding PRs over here, but that would be the easiest.

Thanks again for your work on this.

[mlvandijk]

@olleolleolle @plaindocs Should we (also) still merge this PR? (assuming that will be published right away)

[aslakhellesoy]

Merging this will be published right away, but the change might get lost later unless a similar change is made to the new repo.

[olleolleolle]

I will begin by adding a PR to the docs repo, then when done, merge this one.

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