Google Bucket hold and docs building fix

[ssheorey]

• Put holds on latest artifacts (wheels, tar.gz) in google bucket to prevent deletion.
  Google bucket policy for devel wheels and binaries currently auto-deletes after fixed time (30 days). If no updates are made in that time, docs links become dead. This prevents deletion of latest artifacts.
• Minor fixes to docs for typos.
• Prevent overwriting pinned JInja2 version during make install-pip-package. This causes errors during build docs:
  e.g.: https://github.com/isl-org/Open3D/actions/runs/6710379932/job/18235427697#step:8:11005
• Update build docs instructions

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This change is 

[update-docs]

Thanks for submitting this pull request! The maintainers of this repository would appreciate if you could update the CHANGELOG.md based on your changes.

[errissa]

Reviewed 5 of 6 files at r1, 1 of 2 files at r2, all commit messages.
Reviewable status: 6 of 8 files reviewed, 3 unresolved discussions (waiting on @ssheorey)

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docs/getting_started.in.rst line 86 at r2 (raw file):

      - `Python 3.9 <https://storage.googleapis.com/open3d-releases-master/python-wheels/open3d-@OPEN3D_VERSION_FULL@-cp39-cp39-macosx_10_15_x86_64.whl>`__
      - `Python 3.10 <https://storage.googleapis.com/open3d-releases-master/python-wheels/open3d-@OPEN3D_VERSION_FULL@-cp310-cp310-macosx_10_15_x86_64.whl>`__
      - `Python 3.11 <https://storage.googleapis.com/open3d-releases-master/python-wheels/open3d-@OPEN3D_VERSION_FULL@-cp311-cp311-macosx_10_15_universal2.whl>`__

Is this a Python 3.11 thing? When I build under 3.10 I get a wheel with x86_64 or arm64 not universal2

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util/ci_utils.sh line 420 at r2 (raw file):

    make -j$NPROC
    bin/GLInfo
    export PYTHONPATH="${PYTHONPATH:+${PYTHONPATH}:}:$PWD/lib/python_package"

I don't understand the purpose of this change.

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util/ci_utils.sh line 438 at r2 (raw file):

        -DBUILD_JUPYTER_EXTENSION=OFF \
        ..
    make python-package -j$NPROC

Same as above.

[ssheorey]

Reviewable status: 6 of 8 files reviewed, 1 unresolved discussion (waiting on @errissa)

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docs/getting_started.in.rst line 86 at r2 (raw file):

Previously, errissa (Rene) wrote…

Is this a Python 3.11 thing? When I build under 3.10 I get a wheel with x86_64 or arm64 not universal2

Yes. The current link doesn't work for Python 3.11. Check this link instead:

https://storage.googleapis.com/open3d-releases-master/python-wheels/open3d-0.17.0%2Bad0edd0-cp311-cp311-macosx_10_15_universal2.whl

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util/ci_utils.sh line 420 at r2 (raw file):

Previously, errissa (Rene) wrote…

I don't understand the purpose of this change.

Our install dependencies are inconsistent with our docs dependencies. [Our docs building has a lot of patches and needs a serious upgrade]

make pip-install-package -> uses pip and that installs dependencies, specifically:

Collecting Jinja2>=3.1.2 (from Flask<3.1,>=1.0.4->dash>=2.6.0->-r /home/runner/work/Open3D/Open3D/python/requirements.txt (line 2))

However, we havejinja==3.0.3 pinned in docs/requirements.txt since jinja2 v3.1+ breaks our old version of sphinx. This change is a workaround for this breakage.
The long term solution here is to upgrade our sphinx to the latest to prevent these issues. We have had other problems with newer sphinx versions (e.g. search doesn't work) but they have likely been fixed by now.

This workaround avoids using pip and instead changes PYTHONPATH to point to the built version of Open3D.

[errissa]

Reviewed 1 of 6 files at r1, 1 of 2 files at r2.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @ssheorey)