Placed menu block for subsites by default.

[rupertj]

Implements #13.

NB that this uses the default block placement mechanism from localgovdrupal/localgov_core#212.

I've been testing this PR with this line in composer to use that version of localgov_core:

"localgovdrupal/localgov_core": "dev-feature/2.x/211-installing-blocks as 2.13.2",

[finnlewis]

Hey @rupertj

Just looking at this one alongside localgovdrupal/localgov_core#212

Tried this :

1. fresh install of localgov profile
2. enable the localgov_subsites_extras
3. look for the Subsites menu at admin/structure/block
4. Not seeing it

I note that localgov_subsites_extras does not seem to depend on localgov_subsites. Is that by design?

[finnlewis]

Tested like this:

Fresh install of LocalGov Drupal codebase.

ddev composer require "localgovdrupal/localgov_core:dev-feature/2.x/211-installing-blocks as 2.13.2" -W
ddev composer require "localgovdrupal/localgov_subsites_extras:dev-feature/1.x/13-place-menu-block as 1.0.0-alpha1" -W
ddev drush si localgov -y; 
ddev drush en localgov_subsites_extras -y; 
ddev drush uli;

Then checked that the "Subsiites menu" block is placed in the "Subsites menu" region, which it is now!

Thanks @rupertj - this part of it seems to be working.