Make pdf docs generate in landscape.

Given that almost everything in `labscript-devices` has a really long
name that overfills the page in latex mode, landscape default for the
whole thing is an easy help that reduces the pain.

Author: dihm

docs/source/conf.py

@@ -172,6 +172,13 @@
 else:
     todo_include_todos = True
 
+# -- Options for PDF output --------------------------------------------------
+
+latex_elements = {
+    # make entire document landscape
+    'geometry': '\\usepackage[landscape]{geometry}',
+}
+
 # -- Options for HTML output -------------------------------------------------
 
 # The theme to use for HTML and HTML Help pages.  See the documentation for