Rename repo to terra-cli

[jonpugh]

It's time.

• [x] Rename the repo.
• [x] Remove the packagist package, create a new one at terra/cli
• [x] Alter terra-ops/terra-queue/composer.json to include terra/cli instead.

[EclipseGc]

++

[jonpugh]

Ok! Here goes!

I promise not to put another thing called "terra-app" here so it always redirects.

[jonpugh]

I'm reopening until I'm done renaming everything.