Add/remove some components to be compliant with the latest arch-iso image

[mountaround]

@jorgeluiscarrillo

Since I think your script is very good, I have given some thought to improve it a bit and to be compliant with the latest arch-live-iso.

• Remove the check for an existing internet connection
  -> If the user follows your instructions, then they will already download because of the pacman -Sy git dialog command and this means that a connection to the Internet has already been established successfully.

• Remove the (optional) check of mirror servers for speed
  -> the latest arch-live-iso already executes this as soon as there is an internet connection and sorts the servers according to speed.

• Add intel-ucode/amd-ucode depending on CPU / matching CPU
  -> to make CPU attacks more difficult and to use the latest microcode in general.

• Add an info at README.md that the xf86-video-intel driver is generally used for intel graphics
  -> Then the users know immediately and do not have to check whether the xf86-video-intel or mod-set will be used.

• Consider leaving out linux-firmware if the user installs in a VM
  -> The arch-wiki describes that this can then be omitted (when using VM or container).

[jorgeluiscarrillo]

I will keep this open for now. It is important that we stay up to date with the latest arch iso. It is difficult to keep track since a new ISO is released each month and they are constantly changing things (sometimes even breaking my script). Thanks for bringing attention to these issues and I will consider these changes