GitLab

* First draft

* Some polishing

* Text polishing

* added TOC entry for TTS

* make style

* added links to images

* fixed links to images

* Apply suggestions from code review
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>

* feedback addressed

* feedback from Matthijs addresed

* Update docs/source/en/tasks/text-to-speech.mdx
Co-authored-by: Matthijs Hollemans <mail@hollance.com>

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Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>
Co-authored-by: Matthijs Hollemans <mail@hollance.com>