BasicNarrow behaves like basic, but the spacing is narrower. This is
best for login screens.

Use `@theoryofnekomata` scope to publish package on different
registries.

The "More" logic in LeftSidebarWithMenu logic has been updated to only
show when more sidebar items are visible.

The CSS variables have been documented to help with guiding the user
for configuration.

The components have been adjusted to define variables internally. They
will use internal defaults but will inherit their ascendant's CSS
variables.

Add files from TSDX.