Merge pull request dani-garcia#648 from BlackDex/icon-security

Added missing .env configuration option.

Merge pull request dani-garcia#585 from ViViDboarder/mail-auth-over-i…

…nsecure

Allow explicitly defined smtp auth mechansim

Merge pull request dani-garcia#484 from mprasil/hub_repo_change

Point to the new docker hub image location

Updated .env template

Updated dependencies

Mention relation between DOMAIN and mail settings in .env template

Revert yubikey feature, not needed anymore

Fix AArch64 build by disabling yubico

Merge pull request dani-garcia#294 from i-ghost/feature/add-systemd-n…

…otes

Add systemd setup instructions to README.md

Add info about how to fix dani-garcia#176