- this commit switches our `yarn dev` workflow from heavily relying on
Grunt, to using `nodemon` and `concurrently`
- we're doing this to reduce reliance on Grunt, but also to fix several
nits with the way `yarn dev` works in the monorepo
- we now use `nodemon` to run the Ghost backend, and it should
auto-refresh whenever you change a file in any of the packages (except
`admin`)
- we use `concurrently` to simultaneously run `ghost` and `admin` at
the same time. it seems to handle process cleanup well and has nice
colored prefixes to help with differentiating between log output
- this commit ends up removing a handful of Grunt dependencies and
reduces the functionality stored in the Gruntfile
- on the whole, it should keep existing functionality but there may be
some small underlying changes to get used to
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