fix: Add restart to settings & better disabled state

[mrv777]

Description

• Added the restart button to the settings page as requested here: AxeOS: Make it easier to restart after saving. especially on mobile #440
• Also changed the disabled state so that save is only enabled if there are changes and restart only enabled if changes saved to prevent accidentally clicking that first

[skot]

The restart button is enabled after I click save, but it doesn't actually restart the Bitaxe when I click on it.

[skot]

I'd like to add this functionality to the network tab too 🙏

[mrv777]

Sorry about that, simple fix. Should work now. I'll add it to the network tab later too

[mrv777]

PR updated @skot if you want to test when you get a chance. I tested the settings page, but haven't had a chance yet to upload the changes to a device again to test the network page changes

[skot]

both settings and network work great! I think this is a huge usability improvement, very nice @mrv777