add sphinx tox target

This allows us to build the documentation using

    tox -e sphinx

1 files changed, 9 insertions, 0 deletions

diff --git a/tox.ini b/tox.ini
index cda8de4..0bc9286 100644
--- a/tox.ini
+++ b/tox.ini
@@ -23,3 +23,12 @@ deps =
     types-tabulate
 commands =
     mypy --pretty wikimini
+
+[testenv:sphinx]
+deps =
+    sphinx
+    sphinx_autodoc_typehints
+allowlist_externals = make
+changedir={toxinidir}{/}doc
+commands =
+    make html