Add `.nojekyll` config for GitHub Pages

[d33bs]

Description

This PR adds a .nojekyll file to the GitHub Pages output in order to bypass Jekyll rendering / parsing. I'm adding this change after noticing the HTML wasn't rendering properly in GH Pages. I manually added the .nojekyll file to test whether this fixed the issue within the gh-pages branch. This change persists the configuration for all builds.

What is the nature of your change?

• [ ] Content additions or updates (adds or updates content)
• [x] Bug fix (fixes an issue).
• [ ] Enhancement (adds functionality).
• [ ] Breaking change (these changes would cause existing functionality to not work as expected).

Checklist

Please ensure that all boxes are checked before indicating that this pull request is ready for review.

• [x] I have read the CONTRIBUTING.md guidelines.
• [x] My code follows the style guidelines of this project.
• [x] I have performed a self-review of my own contributions.
• [ ] I have commented my content, particularly in hard-to-understand areas.
• [ ] I have made corresponding changes to related documentation (outside of book content).
• [x] My changes generate no new warnings.
• [x] New and existing tests pass locally with my changes.
• [ ] I have added tests that prove my additions are effective or that my feature works.
• [x] I have deleted all non-relevant text in this pull request template.

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[d33bs]

Thank you @vincerubinetti !