network-homepage: add /security.txt

nix/pkgs/homepage/default.nix

@@ -13,7 +13,7 @@ let
     export-config
     gateway-report network-graphs
     subnetplans switch-report vlan-report;
-  
+
 in
 stdenv.mkDerivation {
   pname = "zentralwerk-network-homepage";
@@ -65,6 +65,7 @@ stdenv.mkDerivation {
 
     ln -s ${network-graphs}/share/doc/zentralwerk/* $DIR/
     ln -s ${../../../doc/core.png} $DIR/core.png
+    ln -s ${./security.txt} $DIR/security.txt
     cp *.{html,css,png,svg} $DIR/
 
     mkdir -p $out/nix-support

nix/pkgs/homepage/security.txt

@@ -0,0 +1,3 @@
+Contact: mailto:astro@spaceboyz.net
+Preferred-Languages: en, de
+Hiring: https://www.c3d2.de/space.html