Touch up existing dashboards

[Kircheneer]

Take a look at the existing dashboards at

• https://github.com/nautobot/nautobot-plugin-capacity-metrics/blob/develop/development/grafana/dashboards/nautobot-internals.json
• https://github.com/nautobot/nautobot-plugin-capacity-metrics/blob/develop/development/grafana/dashboards/nautobot.json
• https://github.com/nautobot/nautobot-plugin-capacity-metrics/blob/develop/nautobot_grafana_dashboard.json

[Kircheneer]

@nniehoff you can assign this to me.