Docs Restructre

[ArpitxGit]

• move setup and motivation at the end @ArpitxGit
• explain only about kokio at main @ArpitxGit
• shorten about eSIM @GuyPhy
• break problems into section @GuyPhy , can move into a blog later
• mention that kokio doesn't make any changes to eSIM infra in solutions rather leverage infra from providers @ArpitxGit
• mention kokio as an aggregator @ArpitxGit
• future goals of kokio second last section @ManulParihar