Drop support for windows 8 and 8.1

[deepak1556]

Refs https://www.electronjs.org/blog/windows-7-to-8-1-deprecation-notice

March milestone:

• Push EOL message via top status bar and notification
• @isidorn to help with updating requirements and FAQ section in the website

May milestone:

• Flip switch in update server to disable updates

[isidorn]

@deepak1556 we do this in April?

[deepak1556]

We can push the client side notification for March release v1.77. Or you mean do we make April release v1.78 as the last release or v1.79 as last release ?

[isidorn]

I meant the notification. So let's assign this to March so we do not lose track :)

[deepak1556]

Steps for the March 2023 milestone are complete.