tBKwtWS/server-hardening: Non-exhuastive tips and advice on server hardening

tBKwtWS 5eea6023f2 expanded on subjects		2 lat temu
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pam.d	5eea6023f2 expanded on subjects	2 lat temu
ssh	5eea6023f2 expanded on subjects	2 lat temu
login.defs	5eea6023f2 expanded on subjects	2 lat temu