test: add section about play single words in e2e test cases

feat: rename label for better mobile compatibility

feat: play word by word with the correct TTS pronunciation

feat: underline the single selected while reproducing it

feat: rename some labels

feat: remove the button for splitting the recorded student audio, refactored interface

feat: handle example selection and input change by resetting audio and text outputs

feat: limit the number of recognized words that can be selected

feat: initial support for split and reproduce single recorded words

feat: update driver.js guided tour

feat: first working driver.js guided tour

feat: move the js js_play_audio function to js.py, update README.md

feat: added text-to-speech in browser, updated e2e playwright test cases

feat: don't show the label for the speech accuracy output

style: improve speech-output style using a custom css

feat: make score de/en components not interactive, fix some typos

feat: save/load the number_score_de and number_score_en components values within the local storage

feat: rename some gradio components, fix some grammar typos

feat: add score DE and EN components

feat: add global score component by language

refactor: read the app description from app_description.md

feat: refactor app.py to add a clear button for the audio TTS component; now a new random phrase clear the tts and stt audio components

feat: update the example section, add a random choice for the phrase

feat: add examples

feat: add text to speech (TTS)

ci: hugginface space, move from docker to gradio sdk v5.6.0, add missing packages.txt with ffmpeg, pre-requirements.txt with pip, update gradio app to properly format informations to frontend, update tests

feat: first working gradio fronted with refactored lambda_handler and tests