Added Whatsapp flatpak

Merge branch 'v22.04' of https://github.com/margrevm/pop-os-post-install into v22.04

Edited readme (closes #9)

Added some apps and replaced codium by VSCode

Changed target directory of clone

Fixed git clone folder path

Making fc-cache less verbose

Specified system scope for flatpak packages

Made script finish cleaner and less verbose

Made apt output less verbose

Fixed java package and made script more interactive

Corrected syntax errors with bash arrays

Correction in readme on how to run the script

Minor changes to the readme file

Added support for other os versions (closing #8)