feat: add various system and theme icons, configuration files, and support assets

squashfs-root/usr/share/pam-configs/unix

@@ -0,0 +1,23 @@
+Name: Unix authentication
+Default: yes
+Priority: 256
+Auth-Type: Primary
+Auth:
+	[success=end default=ignore]	pam_unix.so nullok try_first_pass
+Auth-Initial:
+	[success=end default=ignore]	pam_unix.so nullok
+Account-Type: Primary
+Account:
+	[success=end new_authtok_reqd=done default=ignore]	pam_unix.so
+Account-Initial:
+	[success=end new_authtok_reqd=done default=ignore]	pam_unix.so
+Session-Type: Additional
+Session:
+	required	pam_unix.so
+Session-Initial:
+	required	pam_unix.so
+Password-Type: Primary
+Password:
+	[success=end default=ignore]	pam_unix.so obscure use_authtok try_first_pass yescrypt
+Password-Initial:
+	[success=end default=ignore]	pam_unix.so obscure yescrypt