Add webapp.url back into values.yaml

[alairock]

trafficstars

What

Somehow webapp.url was removed from the example values.yaml file. This was introduced initially as part of this pull request:

https://github.com/airbytehq/airbyte-platform/pull/260

But has since been removed. This value is required to change the links in the notifications, and likely other things.

How

Reverted the line back into existence.

Can this PR be safely reverted and rolled back?

• [X] YES 💚
• [ ] NO ❌

[CLAassistant]

All committers have signed the CLA.

[cgardens]

Hi, we've decided to stop accepting PRs in this repo, so we can focus on supporting our connector contributors. I'm going to close this issue. We appreciate your work here. Please feel free to post an issue in https://github.com/airbytehq/airbyte.

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