Make tutorials a gallery (see description TODO)

def make_github_url(file_name) at conf.py will need modifications

Author: echedey-ls

docs/examples/README.rst

@@ -3,4 +3,4 @@
 Example Gallery
 ===============
 
-This gallery shows examples of pvlib functionality.  Community contributions are welcome!
+This gallery shows examples of pvlib functionality. Community contributions are welcome!

docs/sphinx/source/conf.py

@@ -355,7 +355,9 @@ def setup(app):
 
 # settings for sphinx-gallery
 sphinx_gallery_conf = {
-    'examples_dirs': ['../../examples'],  # location of gallery scripts
+    'examples_dirs': [  # location of gallery scripts
+        '../../examples',
+        '../../tutos_temp'],
     'gallery_dirs': ['gallery'],  # location of generated output
     # sphinx-gallery only shows plots from plot_*.py files by default:
     # 'filename_pattern': '*.py',

docs/tutos_temp/README.rst

@@ -0,0 +1,8 @@
+.. _tutorials_gallery:
+
+Tutorials Gallery
+=================
+
+This gallery shows tutorials about pvlib.
+
+Community contributions are welcome!