[TASK] Improve links in footer of error page

The links at the error page can be improved:

- link to the official donation page
- show typo3.org without protocol

Resolves: #95480
Releases: master
Change-Id: I6a4b3358c8dfc5dc0776a53e9aedb3b72e167166
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/71447


Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Benjamin Franzke <bfr@qbus.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Nikita Hovratov <nikita.h@live.de>
Reviewed-by: Benjamin Franzke <bfr@qbus.de>