the link to heroku 1 click deploy is not right

[lexoyo]

Describe the bug

Note: I reported the same bug on the client side and will propose a PR if it is ok for you. It is a small bug but very confusing to new users because you need to deploy the repo by hand and then you need to know all the env vars and create each one in the settings

When I click on the image "deploy to heroku" in the readme, I should have a UI which asks me the values for the required env vars, cf screenshot bellow

Where was the bug observed

The project readme file

To Reproduce

1- Open the readme
2- click on "deploy to heroku" (
)
3- You will be directed to https://heroku.com/deploy instead of the 1 click install UI of heroku

Expected behavior

I should be redirected to heroku 1 click UI which asks me the values for the required env vars

Screenshots

Heroku 1 click deploy UI which asks me the values for the required env vars, like this:

URL / Environment where this happened

N/A