Fixes: #975

Re-opening from: #976

What had to be changed:

• Changed the logo assets
• Changed the order of the category tabs on iPhone, in order to make the opening animation smooth (from: "opened, categories, downloads, new" to: "categories, new, downloads, opened")
• In terms of the splash screen, since we cannot localise the message, and it's not recommended by Apple to include any text on it:

Avoid including text on your launch screen, even if your first screen displays text. Because the content in a launch screen doesn’t change, any text you display won’t be localized.

• For this reason, I removed the text from the splash screen, we do have it on the loading screen though. Another reason, is that the button and text position is calculated on the rendered image size, which is not possible on the splash screen.
• Slight update is needed on the custom apps side, we need to add the original image width / height, as swiftui is not giving us these values (at least I haven't found a way to do that).
  This extra overhead with the original image size (and any change on the custom app side) can be avoided if we position the buttons (and loading text) relative to the screen height. The only difference will be that the space between the Logo and the buttons (and loading text) will be smaller or larger depending on the screen size.