Add fade in animation for the html body to get around docsify-darklig…

[chris-nowicki]

…ht-theme white flash on reload when in dark mode

Description

This PR fixes bug #23 where, when in dark mode, the page flashes white on reload by adding a fadeInAnimation of .25s for the body in the custom.css file.

What type of PR is this? (check all applicable)

• [ ] 🍕 Feature
• [X] 🐛 Bug Fix
• [ ] 📝 Documentation Update
• [ ] 🎨 Style
• [ ] 🧑‍💻 Code Refactor
• [ ] 🔥 Performance Improvements
• [ ] ✅ Test
• [ ] 🤖 Build
• [ ] 🔁 CI
• [ ] 📦 Chore (Release)
• [ ] ⏩ Revert

Related Tickets & Documents

Closes #23

Mobile & Desktop Screenshots/Recordings

https://github.com/open-sauced/intro/assets/102450568/fe15c6fe-1180-48ab-a32d-3dfeb110e2cf

Added tests?

• [ ] 👍 yes
• [X] 🙅 no, because they aren't needed
• [ ] 🙋 no, because I need help

Added to documentation?

• [ ] 📜 README.md
• [ ] 📓 docs.opensauced.pizza
• [ ] 🍕 dev.to/opensauced
• [ ] 📕 storybook
• [X] 🙅 no documentation needed

[optional] Are there any post-deployment tasks we need to perform?

[optional] What gif best describes this PR or how it makes you feel?

[netlify[bot]]

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[BekahHW]

Thanks, @chris-nowicki!