Delete .jenkins.sh as it uses a pipeline instead

#!/bin/bash

specfiles=$(ls | egrep "^[^.]*.(json|yaml)")

fres=0

for i in $specfiles ; do

    echo "-- Validating and linting OpenAPI file $i..."

    swagger-cli validate "$i"

    res=$?

    speccy lint "$i"

    res2=$?

    fres=$(($fres||$res||$res2))

    echo "--- Validator returned $res, linter returned $res2."

done

echo "-- Final validation returns $fres."

exit $fres