Fix documentation issues for Sphinx upgrade

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Fix any issues that are created by the Sphinx upgrade. Examples found so far include:

• bulleted lists must not have spaces between the items. this is probably on a lot of pages... !Screen Shot 2021-09-12 at 11.20.12 PM.png|thumbnail! !Screen Shot 2021-09-12 at 11.22.49 PM.png|thumbnail!
• images are no longer centered (see [AutoML logo|https://docs.h2o.ai/h2o/latest-stable/h2o-docs/automl.html])

Seems to work ok on older Sphinx (for me, worked fine on v2.1.1). You could test by upgrading to latest version of Sphinx locally to make sure there's no further issues.

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Adam Valenta commented: Issue is fixed by this PR [https://github.com//pull/5957|https://github.com//pull/5957|smart-link]

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Erin LeDell commented: I think this is not totally fixed yet? It’s an environment issue, not a code issue.

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Adam Valenta commented: It is fixed, I have created separate internal issue for the infrastructure cleanup [https://h2oai.atlassian.net/browse/ITA-1003|https://h2oai.atlassian.net/browse/ITA-1003|smart-link].

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Adam Valenta commented: BTW when we upgrade to sphinx==4.2.0, we have to also upgrade sphinx_prompt==1.5.0, sphinx-tabs==3.2.0, and docutils==0.16

The current code works only with sphinx_substitution_extensions==2019.6.15.0 but it is officially not compatible, but the documentation looks good to me, only Tabs changed their color.

!Screenshot 2021-12-23 at 13.02.22.png|width=2560,height=1440!

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JIRA Issue Details

Jira Issue: PUBDEV-8327
Assignee: hannah.tillman
Reporter: Erin LeDell
State: Resolved
Fix Version: 3.36.0.1
Attachments: Available (Count: 3)
Development PRs: N/A

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Attachments From Jira

Attachment Name: Screen Shot 2021-09-12 at 11.20.12 PM.png
Attached By: Erin LeDell
File Link:https://h2o-3-jira-github-migration.s3.amazonaws.com/PUBDEV-8327/Screen Shot 2021-09-12 at 11.20.12 PM.png

Attachment Name: Screen Shot 2021-09-12 at 11.22.49 PM.png
Attached By: Erin LeDell
File Link:https://h2o-3-jira-github-migration.s3.amazonaws.com/PUBDEV-8327/Screen Shot 2021-09-12 at 11.22.49 PM.png

Attachment Name: Screenshot 2021-12-23 at 13.02.22.png
Attached By: Adam Valenta
File Link:https://h2o-3-jira-github-migration.s3.amazonaws.com/PUBDEV-8327/Screenshot 2021-12-23 at 13.02.22.png