What is the "fontconfig" folder in my home directory? May I delete it?
In order to fix the bug involving LibreOffice choosing incorrect font weight, a workaround of creating a fontconfig folder in Home folder during upgrading process was introduced. By right, once the upgrading is over, the folder should be cleaned up but hasn't been done.
I am not sure if there is any bug report filed for this. So, feel free to file one if necessary.
And you can safely delete the folder. The only purpose of the folder was to fix the bug during upgrading and was supposed to be cleaned up anyway.