feat: add bentopdf pdf suite to converters stack

converters/.env.example

@@ -0,0 +1,9 @@
+ACCOUNT_REGISTRATION=false
+HTTP_ALLOWED=false
+ALLOW_UNAUTHENTICAED=false
+AUTO_DELETE_EVERY_N_HOURS=24
+WEBROOT=/convert
+HIDE_HISTORY=false
+LANGUAGE=en
+UNAUTHED_USER_SHARING=false
+MAX_CONVERT_PROCESS=0