Use html_extra_template_renderer to replace the current robots.txt rendering script

docs/conf.py

@@ -161,7 +161,7 @@ html_js_files = ["js/toggle.js"]
 # Add any extra paths that contain custom files (such as robots.txt or
 # .htaccess) here, relative to this directory. These files are copied
 # directly to the root of the documentation.
-html_extra_path = ["_static/css", "_static/robots.txt"]
+html_extra_path = ["_static/css"]
 
 # List of templates of static files to be included in the HTML output.
 # Keys represent paths to input files and values are dicts containing:
@@ -170,6 +170,10 @@ html_extra_path = ["_static/css", "_static/robots.txt"]
 # All paths must be absolute.
 # Rendered templates are automatically added to html_extra_path setting.
 html_extra_templates = {
+    os.path.join(ROOT_PATH, "robots.txt.template"): {
+        'target': os.path.join(ROOT_PATH, "_static/robots.txt"),
+        'context': {'LATEST_VERSION': version},
+    }
 }
 
 # If not '', a 'Last updated on:' timestamp is inserted at every page bottom,