docs: move project structure from readme into documentation

Author: eginhard

README.md

@@ -391,23 +391,3 @@ $ tts --out_path output/path/speech.wav --model_name "<language>/<dataset>/<mode
 ```
 
 <!-- end-tts-readme -->
-
-## Directory Structure
-```
-|- notebooks/       (Jupyter Notebooks for model evaluation, parameter selection and data analysis.)
-|- utils/           (common utilities.)
-|- TTS
-    |- bin/             (folder for all the executables.)
-      |- train*.py                  (train your target model.)
-      |- ...
-    |- tts/             (text to speech models)
-        |- layers/          (model layer definitions)
-        |- models/          (model definitions)
-        |- utils/           (model specific utilities.)
-    |- speaker_encoder/ (Speaker Encoder models.)
-        |- (same)
-    |- vocoder/         (Vocoder models.)
-        |- (same)
-    |- vc/         (Voice conversion models.)
-        |- (same)
-```

docs/source/index.md

@@ -13,6 +13,7 @@ tutorial_for_nervous_beginners
 installation
 docker_images
 faq
+project_structure
 contributing
 ```
 

docs/source/project_structure.md

@@ -0,0 +1,30 @@
+# Project structure
+
+## Directory structure
+
+A non-comprehensive overview of the Coqui source code:
+
+| Directory | Contents |
+| - | - |
+| **Core** | |
+| **[`TTS/`](https://github.com/idiap/coqui-ai-TTS/tree/dev/TTS)** | Main source code |
+| **[`-   .models.json`](https://github.com/idiap/coqui-ai-TTS/tree/dev/TTS/.models.json)** | Pretrained model list |
+| **[`-   api.py`](https://github.com/idiap/coqui-ai-TTS/tree/dev/TTS/api.py)** | Python API |
+| **[`-   bin/`](https://github.com/idiap/coqui-ai-TTS/tree/dev/TTS/bin)** | Executables and CLI |
+| **[`-   tts/`](https://github.com/idiap/coqui-ai-TTS/tree/dev/TTS/tts)** | Text-to-speech models |
+| **[`-       configs/`](https://github.com/idiap/coqui-ai-TTS/tree/dev/TTS/tts/configs)** | Model configurations |
+| **[`-       layers/`](https://github.com/idiap/coqui-ai-TTS/tree/dev/TTS/tts/layers)** | Model layer definitions |
+| **[`-       models/`](https://github.com/idiap/coqui-ai-TTS/tree/dev/TTS/tts/models)** | Model definitions |
+| **[`-   vc/`](https://github.com/idiap/coqui-ai-TTS/tree/dev/TTS/vc)** | Voice conversion models |
+| `-       (same)` | |
+| **[`-   vocoder/`](https://github.com/idiap/coqui-ai-TTS/tree/dev/TTS/vocoder)** | Vocoder models |
+| `-       (same)` | |
+| **[`-   encoder/`](https://github.com/idiap/coqui-ai-TTS/tree/dev/TTS/encoder)** | Speaker encoder models |
+| `-       (same)` | |
+| **Recipes/notebooks** | |
+| **[`notebooks/`](https://github.com/idiap/coqui-ai-TTS/tree/dev/notebooks)** | Jupyter Notebooks for model evaluation, parameter selection and data analysis |
+| **[`recipes/`](https://github.com/idiap/coqui-ai-TTS/tree/dev/recipes)** | Training recipes |
+| **Others** | |
+| **[`pyproject.toml`](https://github.com/idiap/coqui-ai-TTS/tree/dev/pyproject.toml)** | Project metadata, configuration and dependencies |
+| **[`docs/`](https://github.com/idiap/coqui-ai-TTS/tree/dev/docs)** | Documentation |
+| **[`tests/`](https://github.com/idiap/coqui-ai-TTS/tree/dev/tests)** | Unit and integration tests |