Fix symbolic links

Symbolic links can hold arbitrary text, and therefore need an extra
argument `--relative` to take the directory structure into account.

Install/basic-custom

@@ -1,8 +1,8 @@
 #!/usr/bin/fish
 
 # Link resources
-ln --symbolic Templates/config $HOME/.config
-ln --symbolic Templates/bin $HOME/.bin
+ln --relative --symbolic Templates/config $HOME/.config
+ln --relative --symbolic Templates/bin $HOME/.bin
 
 # Export environment variables
 set --export --universal JHE 'jovian-hersemeule.eu'