NetBox should always be referred to as NetBox

Fix all instances of "Netbox".

```Shell
git ls-files -z . | xargs --null -I '{}' find './{}' -type f -print0 | xargs --null sed --in-place --regexp-extended 's#Netbox#NetBox#g;'
```

Ref: https://netbox.readthedocs.io/en/stable/development/style-guide/#branding

.github/workflows/push.yml

@@ -23,7 +23,7 @@ jobs:
         - alpine:edge
       fail-fast: false
     runs-on: ubuntu-latest
-    name: Builds new Netbox Docker Images
+    name: Builds new NetBox Docker Images
     steps:
     - id: git-checkout
       name: Checkout