Broken tab group

[dkocher]

• https://docs.mountainduck.io/mountainduck/installation/

@dkocher Outer Most tab-group needs to be six colons, with the outer most grouptab having five.

Otherwise the Windows-tab group is broken.

I.e.

::::::{tabs}

:::::{group-tab}macos

::::{tabs}

:::{tab}macOS A

…

:::

:::{tab}macOS B

…

:::

::::

:::::

:::::{group-tab} Windows

…

:::::

::::::

Originally posted by @AliveDevil in da2d587