Added config files for RTD

.readthedocs.yaml

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+# .readthedocs.yml
+# Read the Docs configuration file
+# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
+
+# Required
+version: 2
+
+sphinx:
+  configuration: doc/source/conf.py
+  fail_on_warning: true
+
+python:
+  install:
+    - method: pip
+      path: .
+    - requirements: requirements_docs.txt

requirements_docs.txt

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+Copyright (c) 2016-2021, EPFL/Blue Brain Project
+
+This file is part of BluePyOpt <https://github.com/BlueBrain/BluePyOpt>
+This library is free software; you can redistribute it and/or modify it under
+the terms of the GNU Lesser General Public License version 3.0 as published
+by the Free Software Foundation.
+This library is distributed in the hope that it will be useful, but WITHOUT
+ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
+details.
+You should have received a copy of the GNU Lesser General Public License
+along with this library; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+sphinx>=2.0.0
+sphinx-bluebrain-theme
+sphinx-autorun