Fix non-consecutive headers: CI subchapters

[TwoWheelDev]

Summary

Fix non-consecutive headers

Fixes #1421

List of changes proposed in this PR (pull-request)

• reproducible-research/ci/ci-options.md
• reproducible-research/ci/ci-options.md

What should a reviewer concentrate their feedback on?

• Headers are consecutive in the above files

Acknowledging contributors

• All contributors to this pull request are already named in the table of contributors in the README file.
• The following people should be added to the table of contributors in the README file: dlintott

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[malvikasharan]

Thanks for fixing the header issue @DLintott. I am approving this PR to merge. 💪

[malvikasharan]

@all-contributors please add @DLintott for bug fix.

[allcontributors]

@malvikasharan

I've put up a pull request to add @DLintott! 🎉

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