remove agenix and migrate secrets to clan vars

squash this

secrets/gandi.age

@@ -1,8 +1,7 @@
 age-encryption.org/v1
--> ssh-ed25519 JzHbnw eURiwsZGmazGksGekjCeLJah8T5YKJNZHy1LMTh+fDw
-7LBu9JjwrZ+ad0rOrRARRLj2ydho3y5PFUJFvaaXOao
--> ssh-ed25519 8TpKTA SVqAdtOxogTlJJEHm1Ohe7WQ3XfV8lWCPHAn0cj/D0Q
-Fd/E7QUFqirSJsMp9h81R/9V9kRlG8nvF/EoZMynLGE
---- 4dMwgCHnuTMpxeKktAlx4aYwcRwWqBFIFEqUFlY+Avg
-<EFBFBD><EFBFBD>W+<2B><>Bn\N?|<7C>^<EFBFBD>
-<EFBFBD>A+)U<><55><EFBFBD><EFBFBD><EFBFBD><0E>D<EFBFBD>
+-> ssh-ed25519 JzHbnw T31pRlZxX8+uEmZzer9n0L6zuNX0wk4dhqzJGUnJ5BY
+wLPjZofbVL6ujdMz0DCnEa/6aPiQxxO6Lfwfdy4SS+k
+-> ssh-ed25519 8TpKTA IBv4smbKRnRjZ1dnOBTkX/rLO+viU8Bk4ztx4KFkw3I
+Mcl0iIXi6C6tmTXeccnQfSv1QRWVaA4alGcus35b4TQ
+--- hzcS/phyG9Q8F66INJJS4D4ODIpwH+jjPko7PmWBEcA
+8B<EFBFBD><EFBFBD>><3E><><EFBFBD>@<40>^H<><48><EFBFBD><EFBFBD>d<EFBFBD>xb<78>hkt<0F>3<><7F>Yٗ<><03><><EFBFBD>6<EFBFBD>'9b<39>]<0B>xUo>&<11>K<EFBFBD><4B>٧<EFBFBD><D9A7>5!z<><7A>m<EFBFBD>֙x<D699>Qjz3o<33>Y<EFBFBD>I<EFBFBD><49><10>ǟ[<5B>Vt<56><74>v<EFBFBD>|<EFBFBD>