fix(issue-607): add link back to original campaign

[pattishin]

Issue: #607

Steps to re-create:

Requirements, you should have a deployed content-api container and a fully seeded firestore. You may leverage my project if you'd like, just ping.

1. In personal GCP, redeploy content-api container
2. Set env variable EMBLEM_API_URL to that content-api container url

export EMBLEM_API_URL=https://content-api-c55u7v66jq-uc.a.run.app/

3. Open website/ and start running the flask app

cd website/
pip3 install -r requirements.txt
flask run

4. Open browser @ http://localhost:5000/viewDonation?donation_id=00f12b60ba35489f902f

You should see the following. Clicking Back to Campaign will redirect to parent campaign page.

[pattishin]

Thanks ace!