build: update README to indicate that source has moved and delete all files

[parthea]

Towards googleapis/google-cloud-python#10961.

[snippet-bot]

Here is the summary of changes.

You are about to delete 12 region tags.

• samples/generated_samples/texttospeech_v1_generated_text_to_speech_list_voices_async.py:26, tag texttospeech_v1_generated_TextToSpeech_ListVoices_async
• samples/generated_samples/texttospeech_v1_generated_text_to_speech_list_voices_sync.py:26, tag texttospeech_v1_generated_TextToSpeech_ListVoices_sync
• samples/generated_samples/texttospeech_v1_generated_text_to_speech_long_audio_synthesize_synthesize_long_audio_async.py:26, tag texttospeech_v1_generated_TextToSpeechLongAudioSynthesize_SynthesizeLongAudio_async
• samples/generated_samples/texttospeech_v1_generated_text_to_speech_long_audio_synthesize_synthesize_long_audio_sync.py:26, tag texttospeech_v1_generated_TextToSpeechLongAudioSynthesize_SynthesizeLongAudio_sync
• samples/generated_samples/texttospeech_v1_generated_text_to_speech_synthesize_speech_async.py:26, tag texttospeech_v1_generated_TextToSpeech_SynthesizeSpeech_async
• samples/generated_samples/texttospeech_v1_generated_text_to_speech_synthesize_speech_sync.py:26, tag texttospeech_v1_generated_TextToSpeech_SynthesizeSpeech_sync
• samples/generated_samples/texttospeech_v1beta1_generated_text_to_speech_list_voices_async.py:26, tag texttospeech_v1beta1_generated_TextToSpeech_ListVoices_async
• samples/generated_samples/texttospeech_v1beta1_generated_text_to_speech_list_voices_sync.py:26, tag texttospeech_v1beta1_generated_TextToSpeech_ListVoices_sync
• samples/generated_samples/texttospeech_v1beta1_generated_text_to_speech_long_audio_synthesize_synthesize_long_audio_async.py:26, tag texttospeech_v1beta1_generated_TextToSpeechLongAudioSynthesize_SynthesizeLongAudio_async
• samples/generated_samples/texttospeech_v1beta1_generated_text_to_speech_long_audio_synthesize_synthesize_long_audio_sync.py:26, tag texttospeech_v1beta1_generated_TextToSpeechLongAudioSynthesize_SynthesizeLongAudio_sync
• samples/generated_samples/texttospeech_v1beta1_generated_text_to_speech_synthesize_speech_async.py:26, tag texttospeech_v1beta1_generated_TextToSpeech_SynthesizeSpeech_async
• samples/generated_samples/texttospeech_v1beta1_generated_text_to_speech_synthesize_speech_sync.py:26, tag texttospeech_v1beta1_generated_TextToSpeech_SynthesizeSpeech_sync

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