Use hf-doc-builder version from GitHub to build docs locally
This PR aligns the `hf-doc-builder` version used to build docs locally with the one used by our CI: now both use the version in the main branch in the GitHub repository: https://github.com/huggingface/doc-builder

Note that before this PR, local docs building:
- used an old version of `hf-doc-builder` (0.3.0) released on Apr 29, 2022: https://pypi.org/project/hf-doc-builder/0.3.0/
- that version had a bug (it didn't install required package `black`), that we were avoiding by requiring the "quality" extra

Now:
- the above mentioned bug has been fixed in main branch; see:
  - https://github.com/huggingface/doc-builder/pull/434
- we no longer need to install the "quality" extra, so no unnecessary packages are installed: `flake8`, `isort`, `mccabe`, `pycodestyle`, `pyflakes`,...
Use hf-doc-builder version from GitHub to build docs locally: This PR aligns the `hf-doc-builder` version used to build docs locally with the one used by our CI: now both use the version in the main branch in the GitHub repository: https://github.com/huggingface/doc-builder

Note that before this PR, local docs building:
- used an old version of `hf-doc-builder` (0.3.0) released on Apr 29, 2022: https://pypi.org/project/hf-doc-builder/0.3.0/
- that version had a bug (it didn't install required package `black`), that we were avoiding by requiring the "quality" extra

Now:
- the above mentioned bug has been fixed in main branch; see:
  - https://github.com/huggingface/doc-builder/pull/434
- we no longer need to install the "quality" extra, so no unnecessary packages are installed: `flake8`, `isort`, `mccabe`, `pycodestyle`, `pyflakes`,...