Standardize project name to DRANET

[aojea]

We've noticed a few different versions for the project name being used (like "DraNet" or "dranet"), and we think having one official way will help to avoid confusion and make our project easier to find and reference.

Going forward, let's use:

• DRANET in all our public-facing communications, like documentation, blog posts, and social media.

• dranet (lowercase) for technical things like our repo name, package names, and CLI tools, which is pretty standard.

We'll be updating our documentation and other materials to reflect this. If you spot any places we've missed, feel free to let us know or open a PR!