Add Vaultwarden sign up instructions

diff --git a/infrastructure/roles/vaultwarden/README.md b/infrastructure/roles/vaultwarden/README.md
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+# Vaultwarden
+
+Visit `/vaultwarden`, select "create account", then use `$USER@localhost` as your email address.
+
+1. Run `mutt`.
+1. If this is the first execution of `mutt`, press y to create the mail directory.
+1. Locate the "verify your email" message.
+1. Press enter to open the email.
+1. Press ctrl+b to open the URL viewer.
+1. In the URL viewer, you can copy the long verification URL without line breaks.
+1. Press q and any key to exit URL viewer.
+1. Press d to delete the "verify your email" message.
+1. Press d to delete the "welcome" message.
+1. Press d to delete the "new device" message.
+1. Press q and y to exit and purge deleted messages.