[bin][doc] remove obsolete cpp_to_md.sh

bin/doc/cpp_to_md.sh

-#!/bin/sh
-
-# check if help is needed
-if test "$1" = "--help" || test "$1" = "-help" \
-   || test "$1" = "help" || test "$1" = ""; then
-  echo ""
-  echo "USAGE: $0 FILENAME"
-  echo ""
-  echo "The argument should be a C++ header or source file."
-  echo "The file is converted to Markdown and forwarded to stdout."
-  echo "In particular, a C++ comment is converted to its content,"
-  echo "while normal code is put into corresponding Markdown code blocks."
-  echo "Supposed to be called by the script merge_cpp_and_md.sh."
-  exit 0
-fi
-
-if [[ ${1: -3} == ".hh" ]]; then
-  sed '1,/#define/d' $1 >tmpfile
-  isheader=true
-else
-  sed '1,/\*\*\*\*\*\//d' $1 >tmpfile
-  isheader=false
-fi
-
-insidecodeblock=false
-lastline=""
-strippedlastline=""
-firstline=true
-
-while IFS= read -r line
-do
-  strippedline=$(echo $line | sed "s/^[ \t]*//")
-  if [[ $firstline == false ]]; then
-    if [[ ${strippedline:0:2} == "//" ]]; then
-      if [[ $insidecodeblock == true ]]; then
-        if [[ $lastline != "" ]]; then
-          echo "$lastline"
-        fi
-        echo "\`\`\`"
-        insidecodeblock=false
-      else
-        linetoprint=$(echo ${strippedlastline:2} | sed "s/^[ \t]*//")
-        echo "$linetoprint"
-      fi
-    else
-      if [[ $insidecodeblock == false  ]]; then
-        linetoprint=$(echo ${strippedlastline:2} | sed "s/^[ \t]*//")
-        echo "$linetoprint"
-        echo "\`\`\`cpp"
-        insidecodeblock=true
-      else
-        echo "$lastline"
-      fi
-    fi
-  else
-    if [[ ${strippedline:0:2} != "//" && $line != "" ]]; then
-      echo "\`\`\`cpp"
-      insidecodeblock=true
-    fi
-    firstline=false
-  fi
-  lastline="$line"
-  strippedlastline="$strippedline"
-done < tmpfile
-
-if [[ $isheader == false ]]; then
-  if [[ ${strippedlastline:0:2} == "//" ]]; then
-    if [[ $insidecodeblock == true ]]; then
-      echo "\`\`\`"
-      insidecodeblock=false
-    fi
-    linetoprint=$(echo ${strippedlastline:2} | sed "s/^[ \t]*//")
-    echo "$linetoprint"
-  else
-    if [[ $insidecodeblock == false  ]]; then
-      echo "\`\`\`cpp"
-      insidecodeblock=true
-    fi
-    echo "$lastline"
-  fi
-fi
-
-if [[ $insidecodeblock == true ]]; then
-  echo "\`\`\`"
-  insidecodeblock=false
-fi