feat: adds opnix, mennos-laptop-w as host and cleans up secrets

Signed-off-by: Menno van Leeuwen <menno@vleeuwen.me>

secrets/ssh_keys/mennos-2025.pem.gpg

@@ -1,14 +0,0 @@
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-=+p8L
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secrets/ssh_keys/mennos-2025.pub.gpg

@@ -1,8 +0,0 @@
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-
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------END PGP MESSAGE-----

secrets/wireguard/work.wg0.conf.gpg

@@ -1,12 +0,0 @@
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-=Ojnm
------END PGP MESSAGE-----