forum post 3 - tfdashboard for tfgrid v3.8.0 new features

[sasha-astiadi]

make a forum post on new dashboard features and improvement that will be avaiable on tfgrid v3.8.0

• [ ] https://github.com/threefoldtech/tfchain/issues/395
• [ ] https://github.com/threefoldtech/tfgrid_dashboard/issues/258
• [x] https://github.com/threefoldtech/tfchain/issues/422
• [x] https://github.com/threefoldtech/grid3_client_ts/issues/376
• [x] https://github.com/threefoldtech/tfchain/issues/451
• [x] https://github.com/threefoldtech/tfgrid_dashboard/issues/203