Draft: Use drop-in configs

Hanabishi Reccarequested to merge
(removed):dropin into main

This MR implements drop-in configs. Closes #2 (closed).

  • New directory for configs: /etc/nftables.d.
  • The service loads all *.conf files from the aforementioned directory.
  • Install script links old /etc/nftables.conf as /etc/nftables.d/10-nftables.conf to preserve existing working configurations. It makes user able to disable default rules without editing the shipped config.
Edited by Hanabishi Recca

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