We're using the "tenants" subfolder for consistency with the folder
structure we use in ActiveStorage and because some CONSUL installations
might have folders inside the `data` folder which might conflict with
the folders created by tenants.
Note that the Python scripts have a lot of duplication, meaning we need
to change all of them. I'm not refactoring them because I'm not familiar
enough with these scripts (or with Python, for that matter).
Also note that the scripts folder is still shared by all tenants,
meaning it isn't possible to have different scripts for different
tenants. I'm not sure how this situation should be handled; again, I'm
not familiar enough with this feature.
While we ping some search engines (currently, only Google) when
generating the sitemap files, we weren't telling search engines
accessing through the `robots.txt` file where to find the sitemap. Now
we're doing so, using the right sitemap file for the right tenant.
When administrators disabled features and users tried to access them
with the browser, we were responding with a 500 "Internal Server Error"
page, which in my humble opinion was incorrect. There was no error at
all; the server worked exactly as expected.
I think a 403 "Forbidden" code is better; since that feature is
disabled, we're refusing to let users access it.
We could also respond with a 404 "Not found", although I wonder whether
that'll be confusing when administrators temporarily or accidentally
disable a feature.
A similar thing might happen if we responded with a 410 "Gone" code.
Actually this case might be more confusing since users aren't that
familiar with this code.
In any case, all these options are better than the 500 error.
