Update all files (readme, docs, disclaimers etc) with trademark: Apache Iggy™

### Description

Need to update in the project github.com/apache/iggy-website as well.

### Affected area / component

_No response_

### Proposed solution

_No response_

### Alternatives considered

_No response_

### Contribution

- [ ] I'm willing to submit a pull request to implement this feature

### Good first issue

- [ ] I think this could be a good first issue for a new contributor

Search the repository's README, documentation, disclaimers, and other text files for Apache Iggy references, then inspect github.com/apache/iggy-website separately. Confirm the trademark form is applied consistently across the identified project materials and website, and review the resulting diff.

Written by the indexing model from the issue text.