documentation: Get Read the Docs working

[speller26]

Fixed previously failing Read the Docs builds (see aws/amazon-braket-default-simulator-python#46)

Issue #, if available:

Description of changes:

Testing done:

build_files.tar.gz

Merge Checklist

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• [x] I have read the CONTRIBUTING doc
• [x] I used the commit message format described in CONTRIBUTING
• [x] I have updated any necessary documentation, including READMEs and API docs (if appropriate)

Tests

• [ ] I have added tests that prove my fix is effective or that my feature works (if appropriate)
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[amazon-braket-ci-bot]

AWS CodeBuild CI Report

• CodeBuild project: OceanPluginPullRequestBuild
• Commit ID: 7cfd902bad823fa7f1093b73a71ff039137adc85
• Result: SUCCEEDED
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