Set scripts to new run_directory norm

install.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-run_directory=$(dirname "$0")
+run_directory=$(dirname $(readlink -f "$0"))
 
 if [ -f $run_directory/.disabled ]; then
   echo "Installation is disabled. Exiting..."

main.sh

@@ -1,8 +1,9 @@
 #!/usr/bin/env bash
 
-source "$(dirname "$0")/variables.conf"
+run_directory=$(dirname $(readlink -f "$0"))
+source "$run_directory/variables.conf"
 
-KEY="$(dirname "$0")/dns.key"
+KEY="$run_directory/dns.key"
 TTL=604800
 
 FQDN=$(hostname)