Add another donation link to top of Event Form

[reshamas]

On the Event Form page here: https://events.dataumbrella.org/events/new

Update this text.
FROM:

Events can be submitted by anybody but will need to be approved by admins.

TO:
All event submissions will be reviewed by admins. To support the ongoing maintenance of the Events Board, please consider making a donation to Event Board Project.

[reshamas]

@symeneses Do you want to take this issue?

[YolineB]

Follow up with Reshama

[reshamas]

@YolineB
I labeled this one as "Help Wanted"