Remove unused snom files (#13369)

No snom os exists anymore.
According to very old files, sysDescr should contain the string "snom".
I checked on stats and no one reports an snom phone added to LibreNMS.
I can't add the os detection, so just remove these.
Netstats PR will remove other snom references

html/images/os/snom.svg

@@ -1 +0,0 @@
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