Updated qfetch with new color system, added a disk space metric, a ne…

[n1m5n]

Summary of Changes:

• Implemented a color system with the --theme flag, adding themed colors to side bars, ASCII art, and icons.
• Added a disk space metric displayed after memory usage (currently using GB units; this may be adjusted in the future).
• Introduced a new "Cat" ASCII art option.
• Fixed a WSL-specific bug where the script was erroneously printing the copyright license; WSL now functions correctly without errors.

[qvipin]

remind me to review ts soon lol