Terminal Powerline Fonts are not respected - Fix

Hi,

I ran into the issue with the new version of vscode (not only flatpak), that my Hack powerline font does not work anymore on terminal.
I was checking, what could be the issue and all fonts had problems.

On the vscode page [1] I found that they moved to "Nerd" fonts.

Pulling the Hack Nerd font fixed the issue.
https://www.nerdfonts.com/font-downloads

So just adding it here as FYI.
Maybe updating README ?

Thx

[1] https://code.visualstudio.com/updates/v1_68#_improvements-to-contrast-and-the-minimum-contrast-ratio