Add Dedicated Nodes billing info for farmers

[Mik-TF]

Issue

Dedicated nodes aspects are well explained for users but not necessarily for farmers.

The dedicated node aspect of tft farming is not clear enough in the manual for farmers (e.g. how to set a price to dedicated node). We should add a section on the manual for farmers to understand dedicated nodes and how to set the price of a 3Node.

Todo

• add dedicated nodes section in Farming Optimization
  • with info similar to what is found in the gpu section here
  • explain 24h billing cycle
• add info on 24h billing cycle for dedicated nodes in gpu section of farmers

[Mik-TF]

Fix when #382 is merged.