Ability to disable WM

[RabebOthmani]

Context

Now that we are moving the rate of pay and continuous payment control into a global setting, we need a way to allow users to disable WM if they choose to.

Related to https://github.com/interledger/web-monetization-extension/issues/568

Todos

• Design the best way to disable WM
• Implement design

Acceptance Criteria

• An Enable/Disable toggle will be available in the top right corner next to the Settings button.
• When WM is disabled, the following text will show on the screen : 'It looks like Web Monetization is disabled. To enable it, please adjust the toggle (icon) at the top right of the popup.'

[melissahenderson]

I have a suggestion for a shorter string:

It looks like you've disabled Web Monetization. To enable it, click the toggle in the upper right.

A few thoughts, for what they're worth...

• "It looks like Web Monetization is disabled." Is it possible that this message is misunderstood as meaning the site isn't web monetized? I guess anything and everything is possible ;)
• I know saying "please" is polite, but I don't think it's necessary here. Just my opinion.
• I think most people know what a toggle is. I feel strongly that "(icon)" isn't necessary.
• Semantics here, but top-right is where the settings cog is. Either way, if most people know what a toggle is, they won't be confused :)
• I don't think we should use the term "popup". To see the message, the user is already where they need to be. Other than top right or upper right, I don't think we need to clarify where they are in the UI.