Custom element doesn't exist: button-card

[hsellik]

To any Home Assistant newbies like me.

1. Because this is not on HACS, you need the SSH plugin, I found this video to be useful for installing it:
   https://www.youtube.com/watch?v=NTrvgf3vEvg

2. When copying the files to Home Assistant OS via SSH, the entire unified_remote folder has to be copied under
   <home-assistant-config-path>/custom_components

   For me, it looked like this:

   [core-ssh custom_components]$ pwd
   /root/config/custom_components
   [core-ssh custom_components]$ ls
   hacs            unified_remote

3. When adding the button in the last example, you need to install button-card, I suggest the HACS option:
   https://github.com/custom-cards/button-card#installation

   And once the button-card is installed you also need to change the URL of the javascript resource:
   New User: Custom element doesn't exist: button-card custom-cards/button-card#476

After everything was set up. The restart button worked like magic. Pretty neat! 🙂

Hopefully, the Wake on LAN button will work as well.

I'll close the issue and leave it for reference.