fix: Talking Head 1.1.1 — player transcript and cleanup

[soderlind]

This pull request releases version 1.1.1 of the "Talking Head" plugin, focusing on improving compatibility with WordPress subdirectory installations, cleaning up the player UI, and updating documentation and versioning. The most important changes are grouped below:

Player Functionality and Compatibility:

• Improved REST API URL detection in the player block to support WordPress subdirectory installations by dynamically determining the REST API root URL in blocks/player/view.js [1] [2].
• Fixed player transcript loading issues on subdirectory installations [1] [2] [3].

User Interface Updates:

• Removed the redundant download link from the player UI, relying on browser audio controls for download functionality (templates/player.php, README.md) [1] [2] [3] [4].

Code Organization:

• Moved the inline settings page script to an external file (src/Admin/settings-page.js) for better maintainability [1] [2].

Documentation and Versioning:

• Updated plugin version to 1.1.1 in package.json, talking-head.php, and related constants [1] [2] [3] [4].
• Added changelog and upgrade notice entries for version 1.1.1 in CHANGELOG.md and readme.txt [1] [2] [3].