doc: added a link to the Apache license icon

[Radovenchyk]

Checklist:

Important

Please review the checklist below before submitting your pull request.

• Please open an issue before creating a PR or link to an existing issue
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas

Description

Describe the big picture of your changes here to communicate to the maintainers why we should accept this pull request. If it fixes a bug or resolves a feature request, be sure to link to that issue. Close issue syntax: Fixes #<issue number>, see documentation for more details.

Fixes #

Type of Change

• Bug fix
• New feature
• Documentation update
• Enhancement, including but not limited to code refactoring, performance optimization, Test and CI
• Dependency upgrade