Updating Jarvislabs.ai docs

[svishnu88]

Updated docs - start_jarviscloud.md

• Renamed Jarvis Cloud to Jarvislabs.ai. In the earlier docs, Jarvislabs.ai and Jarvis cloud names were mixed up.
• Moved Jarvslabs.ai from the full Linux servers tab to Notebook Servers, as Jarvislabs.ai offers running Jupyter lab out of the box.
• Added details
  • Spot instances
  • New GPU types
  • Updated screenshots of the product
  • Modify instance configuration while resuming

[jph00]

Looks great!