Docs: add documentation privacy info

(and note that the docs site uses Google Analytics)

Author: medmunds

docs/docs_privacy.rst

@@ -0,0 +1,47 @@
+Anymail documentation privacy
+=============================
+
+Anymail's documentation site at `anymail.readthedocs.io`_ is hosted by
+**Read the Docs**. Please see the `Read the Docs Privacy Policy`_ for more
+about what information Read the Docs collects and how they use it.
+
+Separately, Anymail's maintainers have configured **Google Analytics**
+third-party tracking on this documentation site. We (Anymail's maintainers)
+use this analytics data to better understand how these docs are used, for
+the purpose of improving the content. Google Analytics helps us answer
+questions like:
+
+* what docs pages are most and least viewed
+* what terms people search for in the documentation
+* what paths readers (in general) tend to take through the docs
+
+But we're *not* able to identify any particular person or track individual
+behavior. Anymail's maintainers *do not* collect or have access to any
+personally identifiable (or even *potentially* personally identifiable)
+information about visitors to this documentation site.
+
+Anymail's maintainers have *not* connected our Google Analytics implementation
+to any Google Advertising Services. (Incidentally, we're not involved with the
+ads you may see here. Those come from---and support---Read the Docs under
+their `ethical ads`_ model.)
+
+The developer audience for Anymail's docs is likely already familiar
+with site analytics, tracking cookies, and related concepts. To learn more
+about how Google Analytics uses **cookies** and how to **opt out** of
+analytics tracking, see the "Information for Visitors of Sites and Apps Using
+Google Analytics" section of Google's `Safeguarding your data`_ document.
+
+Questions about privacy and information practices related to this Anymail
+documentation site can be emailed to "privacy\<at>anymail\<dot>info".
+(This is not an appropriate contact for questions about *using* Anymail;
+see :ref:`troubleshooting` if you need assistance with your code.)
+
+
+.. _anymail.readthedocs.io:
+    https://anymail.readthedocs.io/
+.. _Read the Docs Privacy Policy:
+    https://docs.readthedocs.io/en/latest/privacy-policy.html
+.. _Safeguarding your data:
+    https://support.google.com/analytics/answer/6004245
+.. _ethical ads:
+    https://docs.readthedocs.io/en/latest/ethical-advertising.html

docs/index.rst

@@ -17,6 +17,7 @@ Documentation
 
 .. toctree::
    :maxdepth: 2
+   :caption: Using Anymail
 
    quickstart
    installation
@@ -25,5 +26,12 @@ Documentation
    esps/index
    tips/index
    troubleshooting
+
+.. toctree::
+   :maxdepth: 2
+   :caption: About Anymail
+
    contributing
    release_notes
+   Docs privacy <docs_privacy>
+