rename app to `Mailtron` and change icon

[timche]

• I opened this PR as a draft to give us some more time to finalize and decide on this renaming.
• Feel free to checkout this PR and build it on your machine.
• Unfortunately renaming the whole project will also change the user data path, so all settings will be gone.
  • We are still at the very beginning and there is not much to configure, so I think it's fine apart from forcing everyone to re-login.
  • We can avoid this by changing productName in build.productName instead and leave everything as is, but this feels kinda messy.
• I think auto-updating won't work anymore after this, so everyone needs to manually update/re-install this app.

This is how the icon looks like in the dock:

Closes #39

[timche]

Overall, looks good. What is the icon.fig file for? I'm not familiar with that extension.

It's a Figma project file, but any app which can open and edit .svg can be used too instead of Figma.

[mskelton]

It's a Figma project file

Okay, so it's like a .ai or .psd file. The source used for generating the images. Right?

[timche]

Correct.

[timche]

I don't have Illustrator or any other vector program, so as I said, any program which can edit .svg can generate the .png too.

[mskelton]

To be clear, I wasn't trying to say we need to have a .ai or .psd file, I just wanted to make sure I understood the purpose of the .fig file. All good! 👍

[timche]

I'm yet not 100% sure how we can do this change and migrate everyone over, as it is practically a new app and manual steps are required. Didn't find any docs/guides how an app can be fully renamed with electron-builder.