Take down obsolete docs at https://fuel-docs.readthedocs.io/

[txaj]

Detailed bug description:
 https://fuel-docs.readthedocs.io is returned by Google on the first page when looking for Fuel documentation. It is obsolete (fuel 3.0, even for master) and may confuse newcomers like I.
Steps to reproduce:
 hit https://fuel-docs.readthedocs.io/en/latest/ , see the "Last updated on 2013/07/31"
Expected results:
 Latest version of Fuel is 8.0, this mirror should be taken down.
Actual result:
 Docs for Fuel 3.0 are shown.
Reproducibility:
 always
Workaround:
 n/a
Impact:
 This is confusing for newcomers.
Description of the environment:
 n/a
Additional information:
 It seems the docs comes from this github repo https://github.com/paly-ch/fuel-docs
 The readthedocs project ( https://readthedocs.org/projects/fuel-docs/ ) is owned by two persons : mirantistcr and plechenko. I'll shoot an email to the latter.

[Fuel Devops McRobotson (fuel-devops-robot)]

Fix proposed to branch: master
Change author: Olga Gusarenko <email address hidden>
Review: https://review.fuel-infra.org/20727

[Fuel Devops McRobotson (fuel-devops-robot)]

Reviewed: https://review.fuel-infra.org/20727
Submitter: Olga Gusarenko <email address hidden>
Branch: master

Commit: a928729cc5a9218d0bcdd7367de85373eeafb1d5
Author: Olga Gusarenko <email address hidden>
Date: Tue May 17 08:05:14 2016

[Fuel <=3.0] Removes references to unsupported releases

Change-Id: I973b994bdcef208399e9a2842c6f95d25fd9f1f0
Partial-bug: #1579674

[Fuel Devops McRobotson (fuel-devops-robot)]

Fix proposed to branch: stable/8.0
Change author: Olga Gusarenko <email address hidden>
Review: https://review.fuel-infra.org/21311

[Fuel Devops McRobotson (fuel-devops-robot)]

Reviewed: https://review.fuel-infra.org/21311
Submitter: Svetlana Karslioglu <email address hidden>
Branch: stable/8.0

Commit: 7fd85e6f84fc12a1e08de0af69962354f0eadebd
Author: Olga Gusarenko <email address hidden>
Date: Thu May 26 15:49:31 2016

[Fuel <=3.0] Removes references to unsupported releases

Change-Id: I973b994bdcef208399e9a2842c6f95d25fd9f1f0
Partial-bug: #1579674
(cherry picked from commit a928729cc5a9218d0bcdd7367de85373eeafb1d5)