[Feature] Removing *testing mode warning - Readme.md

[shrkwy]

Is your feature request related to a problem?

No response

Describe the solution you'd like

I noticed the ⚠️ IMPORTANT NOTICE warning on readme and had ditched using the manager a couple of times only to notice a stable build available in releases section a month later (while using a custom kernel)

Describe alternatives you've considered

No response

Additional context

No response