Feat / disable deprecated receipts cleeng

[royschut]

Description

This PR disables the receipt external link for Cleeng, as the endpoint has been deprecated. Following their release notes of Feb 01 and Feb 26, there is no alternative endpoint and publishers and users should rely on transactional email.

Steps completed:

According to our definition of done, I have completed the following steps:

• [ ] Acceptance criteria met
• [ ] Unit tests added
• [ ] Docs updated (including config and env variables)
• [ ] Translations added
• [x] UX tested
• [x] Browsers / platforms tested
• [x] Rebased & ready to merge without conflicts
• [x] Reviewed own code

[royschut]

Thank you for finding and fixing this!

Welcome. :)

Ready for a merge? @dbudzins @AntonLantukh