Added robots.txt to disallow older version docs. #2833
Merged
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Fixes #2708.
Added a robots.txt file in a new folder to disallow older version docs to show up in search engines. I used Sphinx config option html_extra_path to add the new folder.
I think it makes sense to create a new folder for this, since it can also hold a custom sitemap file, if we decide to add one in the future. However I am open to suggestions on this.
I tested the docs locally and it serves the robots.txt just fine.
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