Pull request: all: imp build time, go mod tidy

Merge in DNS/adguard-home from imp-build-time to master

Squashed commit of the following:

commit 580134d60cfe64fbc3ab388100cf0613095d5b72
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Fri Apr 2 17:48:50 2021 +0300

    all: imp build time, go mod tidy

main.go

@@ -1,5 +1,5 @@
-//go:generate packr clean
-//go:generate packr -z
+//go:generate rm -f ./internal/home/a_home-packr.go
+//go:generate packr -i ./internal/home -z
 package main
 
 import (