docs: update project links in README

[cmltaWt0]

The repo was transferred from raccoongang organization to openedx one. The README instructions should be updated to reflect the current state of the repo.

[openedx-webhooks]

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[mphilbrick211]

Hi @cmltaWt0! When you get a moment, could you add a brief description of the update to the top of the PR? Thanks!

[cmltaWt0]

Closing because the proposed changes are already in develop branch.

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