Rather than set username in flake.nix, set a default value in
default.nix (since it's always called), and set appropriate values in
personal.nix (pixelifytica) and work.nix (elitherl), since the two
files are mutually exclusive and only one or the other will be
imported.
Move more to naming folders after function than specific
program (exception being Emacs...), renamed firefox -> browser and obs
-> streaming
Also move importing obs/streaming to personal.nix instead of default
Move Nyxt config into browser directory
Add some KDE apps: ktorrent for personal, kdenlive and krita for
streaming