Include rtd theme in requirements

Author: mstimberg

docs_sphinx/conf.py

@@ -59,7 +59,7 @@
 
 # General information about the project.
 project = u'brian2tools'
-copyright = u'2016, Brian authors'
+copyright = u'2016–, Brian authors'
 author = u'Brian authors'
 
 # We mock modules that are not needed just for building the documentation
@@ -144,17 +144,12 @@
 
 # -- Options for HTML output ----------------------------------------------
 
-# on_rtd is whether we are on readthedocs.org, this line of code grabbed from docs.readthedocs.org
-on_rtd = os.environ.get('READTHEDOCS', None) == 'True'
-
-if not on_rtd:
-    # ReadTheDocs theme
-    try:
-        import sphinx_rtd_theme
-        html_theme = "sphinx_rtd_theme"
-        html_theme_path = [sphinx_rtd_theme.get_html_theme_path()]
-    except ImportError:
-        pass  # use the default theme
+try:
+    import sphinx_rtd_theme
+    html_theme = "sphinx_rtd_theme"
+    html_theme_path = [sphinx_rtd_theme.get_html_theme_path()]
+except ImportError:
+    pass  # use the default theme
 
 
 # Theme options are theme-specific and customize the look and feel of a theme

pyproject.toml

@@ -42,7 +42,7 @@ dynamic = ["version", "readme"]
 
 [project.optional-dependencies]
 test = ["pytest"]
-docs = ["sphinx>=1.7"]
+docs = ["sphinx>=1.7", "sphinx-rtd-theme"]
 
 [project.urls]
 Homepage = "https://github.com/brian-team/brian2tools"