Add cronjob to notify admin about missing solvers (#314)

[doitwithnotepad]

• Schedule a daily job at midnight to check for solvers using node-schedule.

• Implement checkSolvers(bot) to send a message to the community admin if no solvers are found.

• Increment the count of messages sent to the admin in the database.

• Add logic to disable the community if no solvers are added after a specified number of notifications.

Fixes #314