Remove or Replace `calculateRewardBonus()` with `calculateRewardValue()`

[KelseyCarlow]

Integration with Contract Issue git-token/contracts#8 , proposing moving reward values outside of contract

There is a utility function in the webhook-manager for calculating a reward bonus; the method is not being used. I have proposed in git-token/contracts#10 that the rewardBonus be removed.

The method in the webhook-manager could also be removed or replaced with either express middleware for analyzing the reward or mapping to reward values.

webhook-manager/src/utils/calculateRewardBonus.js

Line 3 in cd12638

export default function calculateRewardBonus({ eventDetails }) {

[Ryanmtate]

#6

dev branch includes WIP for refactoring reward values