remove agenix and migrate secrets to clan vars

squash this

secrets/restic-genepi-storagebox-password.age

@@ -1,7 +1,7 @@
 age-encryption.org/v1
--> ssh-ed25519 JzHbnw 03K1eF97VQ1Gt3LoIVYk6RTJ2wuOoOFpx5Msh1qzb10
-o5qJMOa+AzF7czu1xtx2/aJ+tJqVv14J58pgvGcq4hI
--> ssh-ed25519 8TpKTA AcBv+loPwmanCwbVoQtj2ZD3ZRJ27SJqg0oklQMy7Ec
-uT2oIf9AENKn4SzAbKqT8igUJ6TsoE26iLgs/Ds/Bag
---- JuOE19Ap5gs+hw5sJnrfYFi8G9cesSj626cgxaWV6QY
-<EFBFBD>Y<EFBFBD><EFBFBD><EFBFBD>;<3B>WF<57><46><07><>H<EFBFBD><02><>m<EFBFBD>ՙ<EFBFBD><D599><19><>@<40>"<22>bc<><63>;g
+-> ssh-ed25519 JzHbnw aEdPsShqoC1O4YVmeRnuky+elRay3fAipvIDhgSP02Q
+Gvh/ER7d6VaCXQ/cA2puOrhwz0PQDO7sNfi06X6yw5M
+-> ssh-ed25519 8TpKTA YKagwotojOY57tuvf+lkHh5+1M8NoV3slITN8X/1yD8
+fNf1DBeW5KJMjq1dzi6KR7SR+fw7aFA2CRemRwdE6/M
+--- 5Gfha3Txw0O0a7v0AmJov3shlxihBp4EONcBFPU0NT8
+6<>Vk<56>ѕk<16><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><1D>p|<7C>U~\<5C><>+f<>