Use padd.sh URLs

[dschaper]

By submitting this pull request, I confirm the following:

• I have read and understood the contributors guide, as well as this entire template.
• I have made only one major change in my proposed changes.
• I have commented my proposed changes within the code.
• I have tested my proposed changes, and have included unit tests where possible.
• I am willing to help maintain this change if there are issues with it later.
• I give this submission freely and claim no ownership.
• It is compatible with the EUPL 1.2 license
• I have squashed any insignificant commits. (git rebase)

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What does this PR aim to accomplish?:

Move to https://install.padd.sh URL.

[yubiuser]

We should update, clean and fix the wiki before merging this to master

[yubiuser]

L7: The image does not exist anymore.

Additionally, before we merge this, we need to update the wiki as well (contains old links...)

[github-actions]

Existing merge conflicts have not been addressed. This PR is considered abandoned.

[rdwebdesign]

Should we reopen this PR?

[dschaper]

That's up to you all, the domain is there and available to use.

[rdwebdesign]

I will reopen the PR.

My opinion is: we should use the domain.
As always, I want to hear the opinion of the other team members.

[rdwebdesign]

The proposed change on this PR is simple, but there are a lot of conflicts here.

Note:
https://install.padd.sh is already used on docker-pi-hole.

[github-actions]

Conflicts have been resolved.