Issue704 update bestest hydronic heat pump manufacturer documentation

[Jaap-Neven]

Adapted the link in the index.html file constructing the github pages website to refer to the correct datasheet as found here. Previous link pointed to the main website of Carrier (in Greek).

[dhblum]

Thanks @Jaap-Neven for the PR. Can you:

1. Remove documentation files which I think are related to Issue582 update testcase1 and testcase 3 documentation #706.
2. Also update link in the model html documentation, I think it would here: https://github.com/Jaap-Neven/project1-boptest/blob/issue704_bestest_hydronic_HP_manufacturer_documentation/testcases/bestest_hydronic_heat_pump/models/BESTESTHydronicHeatPump/TestCase.mo#L580
3. Add note of the update in the releasenotes.md in a section "Backwards compatible and does not significantly change benchmark results". See previous release notes for a template.

Also, in future PRs, include a reference to the issue it addresses through a link. For example, by including in the opening comment something like "This is for #704."

[Jaap-Neven]

Hi @dhblum, Thanks for the feedback!
It seems my preliminary changes for #706 are again included here, this is due to the fact i merged the branch for Issue #582 to my main in my own fork, before i forked this main to the branch of this issue. This is something I will avoid in the future, sorry for this.