You cannot deduct the professional services, your labor is never deductible as a charitable contribution.
https://www.irs.gov/publications/p526/ar02.html#en_US_2016_publink1000229698Value of Time or Services
You can't deduct the value of your time or services, including:
Blood donations to the American Red Cross or to blood banks, and
The value of income lost while you work as an unpaid volunteer for a qualified organization.
You can deduct the costs you incur while performing these services such as the hosting service, if it is a cost you incurred only because you were contributing your services to the qualified charity.
https://www.irs.gov/publications/p526/ar02.html#en_US_2016_publink1000229674Although you can't deduct the value of your services given to a qualified organization, you may be able to deduct some amounts you pay in giving services to a qualified organization. The amounts must be:
Unreimbursed,
Directly connected with the services,
Expenses you had only because of the services you gave, and
Not personal, living, or family expenses.