Replace the plugins list view with a more comprehensive system view

[jeremystretch]

NetBox version

v4.0-beta2

Feature type

Change to existing functionality

Proposed functionality

NetBox currently provides a list of installed plugins under Admin > Plugins. We can extend this view to provide a more general "status" view, including other attributes such as the NetBox & Python versions, database size, and other data in addition to the plugins list.

Use case

This would provide a convenient summary of the NetBox deployment.

Database changes

None

External dependencies

None