Create Light and Italic font faces

[Finii]

There are some issues (#44, #45, #58) that can most likely be solved if we create the fonts not from the dynamic Cascadia Code font but select the adequate static font that is also provided by Microsoft.

In this way we can also include the italic and light font faces.

With this PR we have now 5 archives:

• Delugia Powerline
• Delugia Complete
• Delugia Book
• Delugia Powerline Mono
• Delugia Complete Mono

that contains 6 font files each:

• Regular
• Bold
• Italic
• Bold Italic
• Light
• Light Italic

More information is in the discussion of #58.

Also included two font images in the README file.

[Finii]

Hmm, the last 4 commits do not have any commit message. I'm getting lazy :-(

[Finii]

You can see the new README (with 2 example images) rendered here https://github.com/Finii/delugia-code