Include HTML docs in minimal installs (#856)

* Link to stable docs for stable release, otherwise latest docs
* Add build command to setup for making HTML docs
* Change the documentation menu entry to open either online or local HTML
* Update docs build instructions in docs

tests/test_base/test_base_config.py

@@ -544,14 +544,4 @@ def testBaseConfig_Internal(monkeypatch, tmpConf):
         tmpConf._checkOptionalPackages()
         assert tmpConf.hasEnchant is False
 
-    with monkeypatch.context() as mp:
-        mp.setattr("shutil.which", lambda *a: "stuff")
-        tmpConf._checkOptionalPackages()
-        assert tmpConf.hasAssistant is True
-
-    with monkeypatch.context() as mp:
-        mp.setattr("shutil.which", lambda *a: None)
-        tmpConf._checkOptionalPackages()
-        assert tmpConf.hasAssistant is False
-
 # END Test testBaseConfig_Internal