Dashboards

• Charges v2: New dashboard derived from the original Teslamate dashboard with filter by load location, cost and charge type (AC/DC)
• Battery Health: Redesigned the dashboard and added new informative panels about the battery

Full Changelog: https://github.com/CarlosCuezva/dashboards-Grafana-Teslamate/compare/v1.20.0...v1.21.0