Automatically Catch Sphinx Errors (#8530)

* clean up some Sphinx warnings

* first attempt at a doc-test pipeline job

* fix formatting

* fix test name

* set env for bash

* try bash vs script

* maybe it didn't like me setting 'PATH'...derp

* drop use of venv

* sphinx-build isn't a py script

* try activating venv

* docs: remove unused html_static tags

* clean up final sphinx build errors for certbot

* clean up final sphinx build errors for acme

* better names for docs pipeline

* fix spelling

* add docs_extras to setup.py

* remove temp doc-testing pipeline; add template to main.yml

* rearrange pipeline execution; run sphinx builds in one job

* add documentation note to compat.os

* add uninstall.rst as a sub-toctree to avoid build error

certbot/docs/install.rst

@@ -240,6 +240,11 @@ look at the :doc:`packaging`.
 
 Certbot-Auto
 ------------
+.. toctree::
+   :hidden:
+
+   uninstall
+
 
 We used to have a shell script named ``certbot-auto`` to help people install
 Certbot on UNIX operating systems, however, this script is no longer supported.