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/ISSUE_TEMPLATE/config.yml

@@ -2,7 +2,7 @@ blank_issues_enabled: false
 contact_links:
   - name: Question
     url: https://github.com/netbox-community/netbox-docker/discussions
-    about: The Github Discussions are the right place to ask questions about how to use or do certain things with Netbox Docker.
+    about: The Github Discussions are the right place to ask questions about how to use or do certain things with NetBox Docker.
 
   - name: Chat
     url: http://slack.networktocode.com/
@@ -11,5 +11,5 @@ contact_links:
   - name: Community Wiki
     url: https://github.com/netbox-community/netbox-docker/wiki
     about: |
-      Our wiki contains information for common problems and tips for operating Netbox Docker in production.
+      Our wiki contains information for common problems and tips for operating NetBox Docker in production.
       It's maintained by our excellent community.