Add service scripts for Picasso and Einstein

[chemistry-sourabh]

We are still running picasso and einstein from screens which is bad. Better add some service/systemctl scripts and also update the installation script to install them.

[naved001]

Allow me to work on this please! :)

[apoorvemohan]

@chemistry-sourabh can we close this?

[naved001]

• We should run the api server with apache or someting production grade, instead of using the built-in test server.
• For the backend server we can use systemd service.