Document installation via YAML anchors about alacritty HOT 3 OPEN

Not sure if this will play into how we update the documentation but alacritty/alacritty@3c3e687 was added recently and will allow importing additional config files to overwrite settings in the main config file.

It isn't in a released version yet. But I'm imagining we could add a line like

import:
  - ~/.config/alacritty/nord.yml

to the main config file and have it point to src/nord.yml file that the user would download from this repository.

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@amayer5125 Thanks, that's exactly what I was hoping for to be added some day 🥳 That will be the recommended installation method since it won't mess with the users configuration file at all.
I guess we can still add the YAML anchors to the documentation so we end up with…

1. installation per theme file import (recommended, allows to use multiple themes without configuration file mess up)
2. installation via YAML anchors (also allows to use multiple themes defined in the configuration file)
3. manual installation via copy&paste of the Nord colors into the configuration file.

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Alacritty added the configuration file option for sourcing other files (import), in version 0.6.0, released on 2020-11-25.

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