Remove / update information regarding stewards information (re: Telegram)

[JosepBove]

Type of request

• Strategy (planning, high-level discussions, roadmap)
• Tech (infrastructure, tooling, tech stack)
• Other

Why are you raising this issue?

We have references on the website to a telegram channel that has been deprecated in favour of the Discord.

Why do you think it is important?

No response

Can you justify your argument or provide additional resources?

https://github.com/search?q=repo%3Asecurity-alliance%2Fframeworks+Yd9OpSt1UvcyMjU&type=code

Contribution intent

• I can work on implementing this
• I'm raising this for discussion/someone else to handle