Copy files more generically

configs/*:
Copy all files that do not need a rename generically (not specifying a destination file name).
Do not rename vmlinuz-linux to vmlinuz or vmlinuz.efi (as this serves no purpose and makes the scripts more
complicated).
Do not rename microcode (i.e. {amd,intel}-ucode.img) when copying them and change all boot loader configuration files
that assume a renamed microcode image.
Add note and link to Arch Linux wiki to state why memtest.bin is renamed to memtest.
Copy license files for {amd,intel}-ucode and memtest more generically by placing them into subdirectories with the same
name as the package (to circumenvent overwriting one other).

Closes #33