sh: Add tidy-viewer alias tv

Added alias tv which displays a csv(/tsv..) file piped into the pager so
it can have any dimensions and be scrolled through.

sh/.config/sh/alias

@@ -107,6 +107,8 @@ if exist imv-folder; then
     }
 else
     for cmd in imv nsxiv vimiv sxiv feh; do
+        # shellcheck disable=SC2139
+        # since we *want* it defined at definition
         if exist "$cmd"; then alias iv="$cmd"; break; fi
     done
 fi
@@ -128,3 +130,9 @@ fi
 if exist sc-im; then
     alias sc=sc-im
 fi
+
+if exist tidy-viewer; then
+    tv() {
+        tidy-viewer -a -e "$@" | less -S -R
+    }
+fi