Improve handling for raw github repo links (#8483)

* Improve handling for raw github repo links

* Fix strict mode

(cherry picked from commit b1a5b1a)

docs/main.py

@@ -136,17 +136,19 @@ def sourcefile(filename, branch=None, raw=False):
         if not os.path.exists(file_path):
             raise FileNotFoundError(f'Source file {filename} does not exist.')
 
-        repo_url = get_repo_url(raw=raw)
-
-        if raw:
-            url = f'{repo_url}/{branch}/{filename}'
-        else:
-            url = f'{repo_url}/blob/{branch}/{filename}'
+        # Construct repo URL
+        repo_url = get_repo_url(raw=False)
+        url = f'{repo_url}/blob/{branch}/{filename}'
 
         # Check that the URL exists before returning it
         if not check_link(url):
             raise FileNotFoundError(f'URL {url} does not exist.')
 
+        if raw:
+            # If requesting the 'raw' URL, take this into account here...
+            repo_url = get_repo_url(raw=True)
+            url = f'{repo_url}/{branch}/{filename}'
+
         return url
 
     @env.macro