Add “How Litmus works?” heading to Architecture Summary doc

[PriteshKiri]

Description
The Architecture Summary documentation currently explains the control plane and execution plane it also has an explanation about how Litmus works, but it does not have a heading.

Location
website/docs/architecture/architecture-summary.md

Proposed changes
• Add a new heading H2 after "2. Execution Plane" - "How Litmus works?"

[badaljain]

Pls assign it to me

[PriteshKiri]

Hey @badaljain,

Thank you for your interest in contributing! We have assigned you to another issue and are looking forward to your contributions there :)

[adi-ray]

@PriteshKiri would love to work on this