Use SpeechSynthesis api for text-to-speech

[ixrock]

Instead of chrome.tts (which is not supported in Firefox, but works in Brave/Edge?)

Docs: https://developer.mozilla.org/en-US/docs/Web/API/SpeechSynthesis

Quick example for checking support in browsers: speechSynthesis.speak(new SpeechSynthesisUtterance("test")) // say out loud "test"

Extras:

• add playback speed option