Update local build instructions to remove Python version

README.md

@@ -11,11 +11,14 @@ Things to note:
 
 ---
 
-## Building Locally
+## Build HTML Locally
 
-- Run `make html` in the project directory
-- The project will be built in a subfolder at `_build/html` where you can open index.html in a browser as expected
-- Any issues / warnings will be displayed in the console
+You may want to build the HTML locally before pushing, in order to ensure that the result is what you'd expect. These files aren't included in the git repo, nor are they used online; this is solely to create a local, offline version of the online docs.
+
+- Install ``Python``
+- Install ``pip``
+- Navigate to the project directory and use the command ``pip install -r requirements.txt``
+- Build the docs using ``make html``
 
 ---
 

docs/conf.py

@@ -210,4 +210,8 @@
 # -------------------------------------------------------------------------
 
 def setup(app):
-    app.add_stylesheet("theme_overrides.css")  # Fix table wrapping
+    try:
+      app.add_stylesheet("theme_overrides.css")
+
+    except:
+      app.add_css_file("theme_overrides.css")