aliases: add ROT13 command

aliases

@@ -248,6 +248,7 @@ i3b() {
 alias sf=screenfetch
 alias nf=neofetch
 randstr() { tr -dc 'a-zA-Z0-9' /dev/urandom | fold -w $1 | head -n 1; }
+alias rot13="tr '[A-Za-z]' '[N-ZA-Mn-za-m]'"
 
 alias lab="ssh -tt tw '~/ctl' 2>/dev/null"