Remove `webhooks` keyword ambiguity from `README.md`

[ajschmidt8]

The keyword webhooks is used in a lot of different places in the README.md file.

This makes it hard to determine which variables, function names, paths, etc. are related.

This PR updates README.md to remove that ambiguity.

[github-actions[bot]]

:tada: This PR is included in version 3.0.2 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: