Doc - Basic README + last CI updates

docs/README.md

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+## Requirements
+
+In order to generate the documentation, it is necessary to have a Python environment with the
+following:
+```python
+pip install sphinx sphinx_rtd_theme setuptools_rust
+```
+
+It is also necessary to have the `tokenizers` library in this same environment, for Sphinx to
+generate all the API Reference and links properly.  If you want to visualize the documentation with
+some modifications made to the Python bindings, make sure you build it from source.
+
+## Building the documentation
+
+Once everything is setup, you can build the documentation automatically for all the languages
+using the following command in the `/docs` folder:
+
+```bash
+make html_all
+```
+
+If you want to build only for a specific language, you can use:
+
+```bash
+make html O="-t python"
+```
+
+(Replacing `python` by the target language among `rust`, `node`, and `python`)
+
+
+**NOTE**
+
+If you are making any structural change to the documentation, it is recommended to clean the build
+directory before rebuilding:
+
+```bash
+make clean && make html_all
+```