DOC: Update .readthedocs.yml to V2

.readthedocs.yml

@@ -1,13 +1,29 @@
-# conda:
-#     file: docs/environment.yml
-# requirements_file: requirements.txt - this option seems to be ignored by RTD
+# .readthedocs.yml
+# Read the Docs configuration file
+# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
 
+# Required
+version: 2
 
+# Build documentation in the docs/ directory with Sphinx
+sphinx:
+  configuration: documentation/conf.py
+
+# Build documentation with MkDocs
+#mkdocs:
+#  configuration: mkdocs.yml
+
+# Optionally build your docs in additional formats such as PDF
 formats:
-    - htmlzip
-python:
-    setup_py_install: true
-    pip_install: false
-    version: 2.7
-    extra_requirements:
-      - docs
+  - htmlzip
+  - pdf
+
+# Install the pymialsrtk conda environment with all dependencies required to build the doc
+conda:
+  environment: docker/bidsapp/environment.yml
+
+# # Optionally set the version of Python and requirements required to build your docs
+# python:
+#   version: 3.6
+#   install:
+#     - requirements: documentation/requirements.txt